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From: JosephKK on 8 Mar 2010 23:52 On Mon, 08 Mar 2010 08:07:37 +0000, Tim Watts <tw(a)dionic.net> wrote: >JosephKK <quiettechblue(a)yahoo.com> > wibbled on Sunday 07 March 2010 23:22 > > >>>Look at the Atmel AVRs (Tiny for smallness or Mega for more >>>pins/features/Memory). Cheap, programmable in C or ASM from a variety of >>>platforms. >>> >>>I'm an embedded newbie and I have *no* trouble getting them to dance (in >>>C, with which I am familiar), so I reckon anyone could ;-> >> >> So just perzactly what kit did you use? Requiring minds want to know. > >STK500 for around 80 quid as I foresaw a lasting relationship between me and >the DIP versions. > >But it can be done for less - there are lots of ISP to USB programmers >available too that emulate the STK500 protocol. > >HTH > >Tim My time experimenting instead of building standard stuff is easily worth the purchase price indicated.
From: Chris on 9 Mar 2010 19:07 On Mar 6, 5:02 am, Jan Panteltje <pNaonStpealm...(a)yahoo.com> wrote: > On a sunny day (Fri, 5 Mar 2010 19:55:12 -0800 (PST)) it happened Chris > <christopher.man...(a)gmail.com> wrote in > <33f8f59c-4242-428f-8226-d0c6866ce...(a)a10g2000pri.googlegroups.com>: > > > > >> Something like this will be less then 300$: > >>ftp://panteltje.com/pub/24_to_60Hz_PLL_img_1847.jpg > >> the way this is supposed to work is: > >> the camera contact produces a short pulse that opens the 4015 6swicth. > >> That samples the 24 Hz and the system will stabilise so the camara pulse = > >is centered > >> around an edge of that 24 Hz waveform. > >> The 4046 runs at 120 Hz, set for exactly 120 Hz with no camera active. > >> The 7490 has a divide by 2 and a divide by 5, and makes 24 Hz and 60 Hz f= > >rom the 120 Hz. > >> Note the loop filter values. > >> This is not your normal PLL system, but my own invention. > >> Before you invest years in learning to program PICs, > >> maybe you could try this first:-) > >> I have not tried it for this, but at a slightly higher frequency with dif= > >ferent dividers > >> for in a data separator, > >> Extremely stable over a wide range. > >> Just a quick sketch too, not checked for errors. > > >I am interested since I already have the parts. What do you think the > >lock time would be? > > Some remarks to that diagram, I forgot a resistor, and the loop filter values are for 500 kHz. > > \ > ------0 \------ R1 10k ----------------- pin9 4046 > 4016 | | > === C1 | > | | > ------ | +5V > | | R3 1M | > ===C2 R2 | R4 100 Ohm > | | | | > ----------------------------------| +2.5V > | > R5 100 Ohm > | > /// > R1 is 10k > R2 is 2 k > So, looking at the loop filter, for 24 Hz (say 25) versus 500 kHz the values need to be 20000x bigger, > so that makes > C1 20000 x 10 nF = 200 uF > C2 20000 x 1nF = 20 uF > > When the circuit starts up, without the camera running, or connected, the voltage divider formed by R3 R4 > will cause the VCO input of the 4046 to be at 2.5 V, and it should then run exactly at 120 Hz. > > The circuit that you call 'debounce', is not that. > > It is a one shot pulse generator, it generates a small positive pulse that opens the 4016 switch momentarily: > +5V > | -- +4.3V > R6 1k | | > | | | | | pulse, length set by C3 R7 > ------------------0--------------------| |-------------------- -- --------------- -0.7V > | | | | | > | C3 | | > 0 | | > \ --- R7 10k > |camera switch / \ | > | --- | > | | | > ------------------0--------- /// /// > | > /// > > This 4016 switch connects C1 to the 24 Hz square wave from the divide by 5 counter 7490. > If the oscillator is slow, it will connect mostly during the high part, +5V, and C1 will charge fast for a moment. > If the oscillator is too fast, it will connect mostly during the low part (0V) and C1 will discharge fast. > This assures very fast lock time (10k in 200 uF). > This system *also* assures that when pulses are 'missing' the PLL does not veer of to all the way to a low frequency, > but stays at the last frequency, slowly moving to its free-running frequency because of R3. > > One in lock the phase relationship is like this: > > ----- > | | > | | > ------------- ------- sample pulse to 4016 switch > > --------------- -------------- > | | > | | > ------------------------------------------------------------------------- 24 Hz from divide by 5 > > - > | | > ............| | ........ 0 charge current in R1 to C1 > | | > | | > -- > It is an exact phase lock. > > > > >My design is very similar but I need to re design > >the loop filter. I have a large C and small R, but I have seen > >another design that has a a large R and small C. The lock takes > >several seconds tho with the large RC constant. All the wile precious > >film is burning through the camera. If I use a smaller RC constant > >then the jitter becomes unacceptable. > > >Another big problem is the loop is locking on the wrong frequency on > >the camera. It works fine when I simulate the camera with a > >multivibe, but is locking strangely with the camera. I tried a low > >pass to filter bounces, it changed the lock frequency, but still not > >correct. > > >The design requires a lock indication so that the operator will know > >when the pilot tone is up to pitch so that the movie can be slated. > >My fullcoat deck takes about 6 or 7 seconds for the fly wheel to get > >up to speed. The pitch is fine on this, but there is bad flutter > >until the flywheel is at speed. > > I dunno. maybe you can use that other phase comparator in the 4046 as lock indicator? > > >I see that your design incorporates a debounce. I am interested, but > >I am having a little tough time reading the schematic. > > Hope the above helps. > In the diagram the C1 can become negative, maybe use 2 caps in opposite direction in series? > None of the components are critical, and I just calculated them using my neural net (brain). > It is a small market, I think, especially these days, with all digital cameras and post processing... > else I could make some for 300$ a piece:-) > > > Also, I might > >suggest I higher frequency for the VCO, I found that it was more > >stable at a higher frequency, and no big deal to divide down. Divide > >by 80 in the loop, and divide by 32 on the output. > > You can try ;-) > The frequency cap is smaller, and probably has less tolerance, also versus temperature. > But my experienced with the original 4046 and the 74HC4046 are really good any ways, > I always keep some in stock for projects. > Although these day PICs make big inroads :-) > But it is hard to beat an analog PLL in some applications. > > >I am friends with a guy that deals with a lot of pros that shoot small > >gauge film, and I might be able to incorporate this with some software > >and a PCM recorder. Right now, I am just trying to get my camera to > >play with my full coat deck. > > >Chris @ Jan I have the schematic taken from your drawing with the corrections that you indicate. I cannot read the ascii drawings my newsgroup reader does not use a fixed width font, so they are mangled on this end. Here is a link to my copy of your schematic. I am missing a couple of component values. http://chrismaness.com/backend/spice_simulation/IMG_3009.jpg Thanks, Chris Maness
From: Chris on 9 Mar 2010 19:07 On Mar 6, 5:02 am, Jan Panteltje <pNaonStpealm...(a)yahoo.com> wrote: > On a sunny day (Fri, 5 Mar 2010 19:55:12 -0800 (PST)) it happened Chris > <christopher.man...(a)gmail.com> wrote in > <33f8f59c-4242-428f-8226-d0c6866ce...(a)a10g2000pri.googlegroups.com>: > > > > >> Something like this will be less then 300$: > >>ftp://panteltje.com/pub/24_to_60Hz_PLL_img_1847.jpg > >> the way this is supposed to work is: > >> the camera contact produces a short pulse that opens the 4015 6swicth. > >> That samples the 24 Hz and the system will stabilise so the camara pulse = > >is centered > >> around an edge of that 24 Hz waveform. > >> The 4046 runs at 120 Hz, set for exactly 120 Hz with no camera active. > >> The 7490 has a divide by 2 and a divide by 5, and makes 24 Hz and 60 Hz f= > >rom the 120 Hz. > >> Note the loop filter values. > >> This is not your normal PLL system, but my own invention. > >> Before you invest years in learning to program PICs, > >> maybe you could try this first:-) > >> I have not tried it for this, but at a slightly higher frequency with dif= > >ferent dividers > >> for in a data separator, > >> Extremely stable over a wide range. > >> Just a quick sketch too, not checked for errors. > > >I am interested since I already have the parts. What do you think the > >lock time would be? > > Some remarks to that diagram, I forgot a resistor, and the loop filter values are for 500 kHz. > > \ > ------0 \------ R1 10k ----------------- pin9 4046 > 4016 | | > === C1 | > | | > ------ | +5V > | | R3 1M | > ===C2 R2 | R4 100 Ohm > | | | | > ----------------------------------| +2.5V > | > R5 100 Ohm > | > /// > R1 is 10k > R2 is 2 k > So, looking at the loop filter, for 24 Hz (say 25) versus 500 kHz the values need to be 20000x bigger, > so that makes > C1 20000 x 10 nF = 200 uF > C2 20000 x 1nF = 20 uF > > When the circuit starts up, without the camera running, or connected, the voltage divider formed by R3 R4 > will cause the VCO input of the 4046 to be at 2.5 V, and it should then run exactly at 120 Hz. > > The circuit that you call 'debounce', is not that. > > It is a one shot pulse generator, it generates a small positive pulse that opens the 4016 switch momentarily: > +5V > | -- +4.3V > R6 1k | | > | | | | | pulse, length set by C3 R7 > ------------------0--------------------| |-------------------- -- --------------- -0.7V > | | | | | > | C3 | | > 0 | | > \ --- R7 10k > |camera switch / \ | > | --- | > | | | > ------------------0--------- /// /// > | > /// > > This 4016 switch connects C1 to the 24 Hz square wave from the divide by 5 counter 7490. > If the oscillator is slow, it will connect mostly during the high part, +5V, and C1 will charge fast for a moment. > If the oscillator is too fast, it will connect mostly during the low part (0V) and C1 will discharge fast. > This assures very fast lock time (10k in 200 uF). > This system *also* assures that when pulses are 'missing' the PLL does not veer of to all the way to a low frequency, > but stays at the last frequency, slowly moving to its free-running frequency because of R3. > > One in lock the phase relationship is like this: > > ----- > | | > | | > ------------- ------- sample pulse to 4016 switch > > --------------- -------------- > | | > | | > ------------------------------------------------------------------------- 24 Hz from divide by 5 > > - > | | > ............| | ........ 0 charge current in R1 to C1 > | | > | | > -- > It is an exact phase lock. > > > > >My design is very similar but I need to re design > >the loop filter. I have a large C and small R, but I have seen > >another design that has a a large R and small C. The lock takes > >several seconds tho with the large RC constant. All the wile precious > >film is burning through the camera. If I use a smaller RC constant > >then the jitter becomes unacceptable. > > >Another big problem is the loop is locking on the wrong frequency on > >the camera. It works fine when I simulate the camera with a > >multivibe, but is locking strangely with the camera. I tried a low > >pass to filter bounces, it changed the lock frequency, but still not > >correct. > > >The design requires a lock indication so that the operator will know > >when the pilot tone is up to pitch so that the movie can be slated. > >My fullcoat deck takes about 6 or 7 seconds for the fly wheel to get > >up to speed. The pitch is fine on this, but there is bad flutter > >until the flywheel is at speed. > > I dunno. maybe you can use that other phase comparator in the 4046 as lock indicator? > > >I see that your design incorporates a debounce. I am interested, but > >I am having a little tough time reading the schematic. > > Hope the above helps. > In the diagram the C1 can become negative, maybe use 2 caps in opposite direction in series? > None of the components are critical, and I just calculated them using my neural net (brain). > It is a small market, I think, especially these days, with all digital cameras and post processing... > else I could make some for 300$ a piece:-) > > > Also, I might > >suggest I higher frequency for the VCO, I found that it was more > >stable at a higher frequency, and no big deal to divide down. Divide > >by 80 in the loop, and divide by 32 on the output. > > You can try ;-) > The frequency cap is smaller, and probably has less tolerance, also versus temperature. > But my experienced with the original 4046 and the 74HC4046 are really good any ways, > I always keep some in stock for projects. > Although these day PICs make big inroads :-) > But it is hard to beat an analog PLL in some applications. > > >I am friends with a guy that deals with a lot of pros that shoot small > >gauge film, and I might be able to incorporate this with some software > >and a PCM recorder. Right now, I am just trying to get my camera to > >play with my full coat deck. > > >Chris @ Jan I have the schematic taken from your drawing with the corrections that you indicate. I cannot read the ascii drawings my newsgroup reader does not use a fixed width font, so they are mangled on this end. Here is a link to my copy of your schematic. I am missing a couple of component values. http://chrismaness.com/backend/spice_simulation/IMG_3009.jpg Thanks, Chris Maness
From: JosephKK on 10 Mar 2010 00:19 On Tue, 9 Mar 2010 16:07:57 -0800 (PST), Chris <christopher.maness(a)gmail.com> wrote: >On Mar 6, 5:02 am, Jan Panteltje <pNaonStpealm...(a)yahoo.com> wrote: >> On a sunny day (Fri, 5 Mar 2010 19:55:12 -0800 (PST)) it happened Chris >> <christopher.man...(a)gmail.com> wrote in >> <33f8f59c-4242-428f-8226-d0c6866ce...(a)a10g2000pri.googlegroups.com>: >> >> >> >> >> Something like this will be less then 300$: >> >>ftp://panteltje.com/pub/24_to_60Hz_PLL_img_1847.jpg >> >> the way this is supposed to work is: >> >> the camera contact produces a short pulse that opens the 4015 6swicth. >> >> That samples the 24 Hz and the system will stabilise so the camara pulse = >> >is centered >> >> around an edge of that 24 Hz waveform. >> >> The 4046 runs at 120 Hz, set for exactly 120 Hz with no camera active. >> >> The 7490 has a divide by 2 and a divide by 5, and makes 24 Hz and 60 Hz f= >> >rom the 120 Hz. >> >> Note the loop filter values. >> >> This is not your normal PLL system, but my own invention. >> >> Before you invest years in learning to program PICs, >> >> maybe you could try this first:-) >> >> I have not tried it for this, but at a slightly higher frequency with dif= >> >ferent dividers >> >> for in a data separator, >> >> Extremely stable over a wide range. >> >> Just a quick sketch too, not checked for errors. >> >> >I am interested since I already have the parts. What do you think the >> >lock time would be? >> >> Some remarks to that diagram, I forgot a resistor, and the loop filter values are for 500 kHz. >> >> \ >> ------0 \------ R1 10k ----------------- pin9 4046 >> 4016 | | >> === C1 | >> | | >> ------ | +5V >> | | R3 1M | >> ===C2 R2 | R4 100 Ohm >> | | | | >> ----------------------------------| +2.5V >> | >> R5 100 Ohm >> | >> /// >> R1 is 10k >> R2 is 2 k >> So, looking at the loop filter, for 24 Hz (say 25) versus 500 kHz the values need to be 20000x bigger, >> so that makes >> C1 20000 x 10 nF = 200 uF >> C2 20000 x 1nF = 20 uF >> >> When the circuit starts up, without the camera running, or connected, the voltage divider formed by R3 R4 >> will cause the VCO input of the 4046 to be at 2.5 V, and it should then run exactly at 120 Hz. >> >> The circuit that you call 'debounce', is not that. >> >> It is a one shot pulse generator, it generates a small positive pulse that opens the 4016 switch momentarily: >> +5V >> | -- +4.3V >> R6 1k | | >> | | | | | pulse, length set by C3 R7 >> ------------------0--------------------| |-------------------- -- --------------- -0.7V >> | | | | | >> | C3 | | >> 0 | | >> \ --- R7 10k >> |camera switch / \ | >> | --- | >> | | | >> ------------------0--------- /// /// >> | >> /// >> >> This 4016 switch connects C1 to the 24 Hz square wave from the divide by 5 counter 7490. >> If the oscillator is slow, it will connect mostly during the high part, +5V, and C1 will charge fast for a moment. >> If the oscillator is too fast, it will connect mostly during the low part (0V) and C1 will discharge fast. >> This assures very fast lock time (10k in 200 uF). >> This system *also* assures that when pulses are 'missing' the PLL does not veer of to all the way to a low frequency, >> but stays at the last frequency, slowly moving to its free-running frequency because of R3. >> >> One in lock the phase relationship is like this: >> >> ----- >> | | >> | | >> ------------- ------- sample pulse to 4016 switch >> >> --------------- -------------- >> | | >> | | >> ------------------------------------------------------------------------- 24 Hz from divide by 5 >> >> - >> | | >> ............| | ........ 0 charge current in R1 to C1 >> | | >> | | >> -- >> It is an exact phase lock. >> >> >> >> >My design is very similar but I need to re design >> >the loop filter. I have a large C and small R, but I have seen >> >another design that has a a large R and small C. The lock takes >> >several seconds tho with the large RC constant. All the wile precious >> >film is burning through the camera. If I use a smaller RC constant >> >then the jitter becomes unacceptable. >> >> >Another big problem is the loop is locking on the wrong frequency on >> >the camera. It works fine when I simulate the camera with a >> >multivibe, but is locking strangely with the camera. I tried a low >> >pass to filter bounces, it changed the lock frequency, but still not >> >correct. >> >> >The design requires a lock indication so that the operator will know >> >when the pilot tone is up to pitch so that the movie can be slated. >> >My fullcoat deck takes about 6 or 7 seconds for the fly wheel to get >> >up to speed. The pitch is fine on this, but there is bad flutter >> >until the flywheel is at speed. >> >> I dunno. maybe you can use that other phase comparator in the 4046 as lock indicator? >> >> >I see that your design incorporates a debounce. I am interested, but >> >I am having a little tough time reading the schematic. >> >> Hope the above helps. >> In the diagram the C1 can become negative, maybe use 2 caps in opposite direction in series? >> None of the components are critical, and I just calculated them using my neural net (brain). >> It is a small market, I think, especially these days, with all digital cameras and post processing... >> else I could make some for 300$ a piece:-) >> >> > Also, I might >> >suggest I higher frequency for the VCO, I found that it was more >> >stable at a higher frequency, and no big deal to divide down. Divide >> >by 80 in the loop, and divide by 32 on the output. >> >> You can try ;-) >> The frequency cap is smaller, and probably has less tolerance, also versus temperature. >> But my experienced with the original 4046 and the 74HC4046 are really good any ways, >> I always keep some in stock for projects. >> Although these day PICs make big inroads :-) >> But it is hard to beat an analog PLL in some applications. >> >> >I am friends with a guy that deals with a lot of pros that shoot small >> >gauge film, and I might be able to incorporate this with some software >> >and a PCM recorder. Right now, I am just trying to get my camera to >> >play with my full coat deck. >> >> >Chris > >@ Jan > >I have the schematic taken from your drawing with the corrections that >you indicate. I cannot read the ascii drawings my newsgroup reader >does not use a fixed width font, so they are mangled on this end. >Here is a link to my copy of your schematic. I am missing a couple of >component values. > >http://chrismaness.com/backend/spice_simulation/IMG_3009.jpg > >Thanks, >Chris Maness It is not fun and it has to be done each time, but Google groups can be made to behave.
From: linnix on 10 Mar 2010 02:19
On Mar 9, 4:07 pm, Chris <christopher.man...(a)gmail.com> wrote: > On Mar 6, 5:02 am, Jan Panteltje <pNaonStpealm...(a)yahoo.com> wrote: > > > > > On a sunny day (Fri, 5 Mar 2010 19:55:12 -0800 (PST)) it happened Chris > > <christopher.man...(a)gmail.com> wrote in > > <33f8f59c-4242-428f-8226-d0c6866ce...(a)a10g2000pri.googlegroups.com>: > > > >> Something like this will be less then 300$: > > >>ftp://panteltje.com/pub/24_to_60Hz_PLL_img_1847.jpg > > >> the way this is supposed to work is: > > >> the camera contact produces a short pulse that opens the 4015 6swicth. > > >> That samples the 24 Hz and the system will stabilise so the camara pulse = > > >is centered > > >> around an edge of that 24 Hz waveform. > > >> The 4046 runs at 120 Hz, set for exactly 120 Hz with no camera active. > > >> The 7490 has a divide by 2 and a divide by 5, and makes 24 Hz and 60 Hz f= > > >rom the 120 Hz. > > >> Note the loop filter values. > > >> This is not your normal PLL system, but my own invention. > > >> Before you invest years in learning to program PICs, > > >> maybe you could try this first:-) > > >> I have not tried it for this, but at a slightly higher frequency with dif= > > >ferent dividers > > >> for in a data separator, > > >> Extremely stable over a wide range. > > >> Just a quick sketch too, not checked for errors. > > > >I am interested since I already have the parts. What do you think the > > >lock time would be? > > > Some remarks to that diagram, I forgot a resistor, and the loop filter values are for 500 kHz. > > > \ > > ------0 \------ R1 10k ----------------- pin9 4046 > > 4016 | | > > === C1 | > > | | > > ------ | +5V > > | | R3 1M | > > ===C2 R2 | R4 100 Ohm > > | | | | > > ----------------------------------| +2.5V > > | > > R5 100 Ohm > > | > > /// > > R1 is 10k > > R2 is 2 k > > So, looking at the loop filter, for 24 Hz (say 25) versus 500 kHz the values need to be 20000x bigger, > > so that makes > > C1 20000 x 10 nF = 200 uF > > C2 20000 x 1nF = 20 uF > > > When the circuit starts up, without the camera running, or connected, the voltage divider formed by R3 R4 > > will cause the VCO input of the 4046 to be at 2.5 V, and it should then run exactly at 120 Hz. > > > The circuit that you call 'debounce', is not that. > > > It is a one shot pulse generator, it generates a small positive pulse that opens the 4016 switch momentarily: > > +5V > > | -- +4.3V > > R6 1k | | > > | | | | | pulse, length set by C3 R7 > > ------------------0--------------------| |-------------------- -- --------------- -0.7V > > | | | | | > > | C3 | | > > 0 | | > > \ --- R7 10k > > |camera switch / \ | > > | --- | > > | | | > > ------------------0--------- /// /// > > | > > /// > > > This 4016 switch connects C1 to the 24 Hz square wave from the divide by 5 counter 7490. > > If the oscillator is slow, it will connect mostly during the high part, +5V, and C1 will charge fast for a moment. > > If the oscillator is too fast, it will connect mostly during the low part (0V) and C1 will discharge fast. > > This assures very fast lock time (10k in 200 uF). > > This system *also* assures that when pulses are 'missing' the PLL does not veer of to all the way to a low frequency, > > but stays at the last frequency, slowly moving to its free-running frequency because of R3. > > > One in lock the phase relationship is like this: > > > ----- > > | | > > | | > > ------------- ------- sample pulse to 4016 switch > > > --------------- -------------- > > | | > > | | > > ------------------------------------------------------------------------- 24 Hz from divide by 5 > > > - > > | | > > ............| | ........ 0 charge current in R1 to C1 > > | | > > | | > > -- > > It is an exact phase lock. > > > >My design is very similar but I need to re design > > >the loop filter. I have a large C and small R, but I have seen > > >another design that has a a large R and small C. The lock takes > > >several seconds tho with the large RC constant. All the wile precious > > >film is burning through the camera. If I use a smaller RC constant > > >then the jitter becomes unacceptable. > > > >Another big problem is the loop is locking on the wrong frequency on > > >the camera. It works fine when I simulate the camera with a > > >multivibe, but is locking strangely with the camera. I tried a low > > >pass to filter bounces, it changed the lock frequency, but still not > > >correct. > > > >The design requires a lock indication so that the operator will know > > >when the pilot tone is up to pitch so that the movie can be slated. > > >My fullcoat deck takes about 6 or 7 seconds for the fly wheel to get > > >up to speed. The pitch is fine on this, but there is bad flutter > > >until the flywheel is at speed. > > > I dunno. maybe you can use that other phase comparator in the 4046 as lock indicator? > > > >I see that your design incorporates a debounce. I am interested, but > > >I am having a little tough time reading the schematic. > > > Hope the above helps. > > In the diagram the C1 can become negative, maybe use 2 caps in opposite direction in series? > > None of the components are critical, and I just calculated them using my neural net (brain). > > It is a small market, I think, especially these days, with all digital cameras and post processing... > > else I could make some for 300$ a piece:-) > > > > Also, I might > > >suggest I higher frequency for the VCO, I found that it was more > > >stable at a higher frequency, and no big deal to divide down. Divide > > >by 80 in the loop, and divide by 32 on the output. > > > You can try ;-) > > The frequency cap is smaller, and probably has less tolerance, also versus temperature. > > But my experienced with the original 4046 and the 74HC4046 are really good any ways, > > I always keep some in stock for projects. > > Although these day PICs make big inroads :-) > > But it is hard to beat an analog PLL in some applications. > > > >I am friends with a guy that deals with a lot of pros that shoot small > > >gauge film, and I might be able to incorporate this with some software > > >and a PCM recorder. Right now, I am just trying to get my camera to > > >play with my full coat deck. > > > >Chris > > @ Jan > > I have the schematic taken from your drawing with the corrections that > you indicate. I cannot read the ascii drawings my newsgroup reader > does not use a fixed width font, so they are mangled on this end. > Here is a link to my copy of your schematic. I am missing a couple of > component values. > > http://chrismaness.com/backend/spice_simulation/IMG_3009.jpg > > Thanks, > Chris Maness I am not sure how exactly that would work, but just some common senses. Take for example, your 2M resistor and 200uF capacitor will have a time constant of the order 400 seconds. How would that affect your 24Hz PLL? |