Ultra low frequency VCO
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From: Daku on 5 Jul 2010 03:01 Could some electronics guru please help ? Is there any commonly available reference design for an ultra low frequency voltage controlled oscillator ? I developed a 60 Hz center frequency SPICE model using common op-amps. I was wondering if there are any reference designs out there. Any feedback would be very useful. Thanks in advance for your help.
From: Tim Williams on 5 Jul 2010 04:41 http://webpages.charter.net/dawill/tmoranwms/Circuits_2008/Triangle.gif Replace 25k pot with control voltage input. In a single range, this thing will go from 1Hz to 4.5MHz. That was with Ct = 680pF. Put in, say, 0.1uF and it will gladly do milihertz. Tim -- Deep Friar: a very philosophical monk. Website: http://webpages.charter.net/dawill/tmoranwms "Daku" <dakupoto(a)gmail.com> wrote in message news:0e2f803e-bc15-4688-97e8-93bd0ee7b582(a)k8g2000prh.googlegroups.com... > Could some electronics guru please help ? Is there any commonly > available reference design for an ultra low frequency voltage > controlled oscillator ? I developed a 60 Hz center frequency SPICE > model using common op-amps. I was wondering if there are any reference > designs out there. > Any feedback would be very useful. Thanks in advance for your help.
From: Jasen Betts on 5 Jul 2010 07:19 On 2010-07-05, Daku <dakupoto(a)gmail.com> wrote: > Could some electronics guru please help ? Is there any commonly > available reference design for an ultra low frequency voltage > controlled oscillator ? I developed a 60 Hz center frequency SPICE > model using common op-amps. I was wondering if there are any reference > designs out there. > Any feedback would be very useful. Thanks in advance for your help. LM555 ? --- news://freenews.netfront.net/ - complaints: news(a)netfront.net ---
From: Spehro Pefhany on 5 Jul 2010 08:31 On Mon, 5 Jul 2010 00:01:47 -0700 (PDT), the renowned Daku <dakupoto(a)gmail.com> wrote: >Could some electronics guru please help ? Is there any commonly >available reference design for an ultra low frequency voltage >controlled oscillator ? I developed a 60 Hz center frequency SPICE >model using common op-amps. I was wondering if there are any reference >designs out there. >Any feedback would be very useful. Thanks in advance for your help. There's one on the LM324 datasheet that will be happy enough at 60Hz, plus it only uses 10-15 cents worth of parts. Best regards, Spehro Pefhany -- "it's the network..." "The Journey is the reward" speff(a)interlog.com Info for manufacturers: http://www.trexon.com Embedded software/hardware/analog Info for designers: http://www.speff.com
From: terryS on 5 Jul 2010 11:47
On Jul 5, 10:31 am, Spehro Pefhany <speffS...(a)interlogDOTyou.knowwhat> wrote: > On Mon, 5 Jul 2010 00:01:47 -0700 (PDT), the renowned Daku > > <dakup...(a)gmail.com> wrote: > >Could some electronics guru please help ? Is there any commonly > >available reference design for an ultra low frequency voltage > >controlled oscillator ? I developed a 60 Hz center frequency SPICE > >model using common op-amps. I was wondering if there are any reference > >designs out there. > >Any feedback would be very useful. Thanks in advance for your help. > > There's one on the LM324 datasheet that will be happy enough at 60Hz, > plus it only uses 10-15 cents worth of parts. > > Best regards, > Spehro Pefhany > -- > "it's the network..." "The Journey is the reward" > sp...(a)interlog.com Info for manufacturers:http://www.trexon.com > Embedded software/hardware/analog Info for designers: http://www.speff.com Unsophisticated and fixed one could use three components? From a DC (or rectified AC) source of more tha 100 volts. A resistor, a neon and a capacitor. Size of capacitor determines rate. I think it used to be called a 'Relaxation oscillator'? |