Unusual functions of cheap parts
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From: Henry Kiefer on 26 Nov 2005 18:41 Yes Martin. I've seen that and a refrigerator can it too! - Henry "martin griffith" <martingriffith(a)XXyahoo.co.uk> schrieb im Newsbeitrag news:ft1ho1du06kls05nge61k2so27j1b41rk3(a)4ax.com... > On Thu, 24 Nov 2005 09:40:27 +0100, in sci.electronics.design "Henry > Kiefer" <otc_friend(a)gmx.net> wrote: > > >Hi all - > > > >After my first thread going from "standard" cheap parts for up to vhf > >frequency to a discussion about the usefulness of Spice simulator...... I > >try it another time hopefully get attention of frustrated co-readers: > > > >For example the rechtifier diode 1N4007 can be used as a rf switching diode, > >for example as rx/tx-switch. This is because it is a pin structure diode. > >This type is cheap and you can get it almost everywhere. It shows good > >performance for the price. Surely for high-end you should do it with another > >type tuned to the application it is made for. But anyway it works in some > >circuits. > > > >Do you know of other interesting devices or circuits good for misuse? > > > >Best regards - > >Henry > > > Switching a 20 year old 24v weller soldering iron on and off is a good > test for seeing if an 8051 cpu board is EMC proof > > > martin
From: Henry Kiefer on 26 Nov 2005 18:54 Can you give details? - Henry "John Larkin" <jjlarkin(a)highNOTlandTHIStechnologyPART.com> schrieb im Newsbeitrag news:nasho1do5hpdjfa6iq5tjsqadruc4taqai(a)4ax.com... > On Fri, 25 Nov 2005 10:52:26 +0100, "Frithiof Andreas Jensen" > <frithiof.jensen(a)die_spammer_die.ericsson.com> wrote: > > > > >"Henry Kiefer" <otc_friend(a)gmx.net> wrote in message > >news:4385b3b1$1$27887$9b4e6d93(a)newsread4.arcor-online.net... > > > >> Do you know of other interesting devices or circuits good for misuse? > > > >LED's work both ways, as a light emitter and a photodiode. > > > > And optocouplers can do interesting things: > > Very simple high-voltage opamp, up to 400 volts p-p. > > Isolated totem-pole driver, from a few volts up to 400. > > Current limiter. > > Low-leakage diode, sort of like an LED painted black. > > John >
From: John Larkin on 26 Nov 2005 19:30 On Sun, 27 Nov 2005 00:54:27 +0100, "Henry Kiefer" <otc_friend(a)gmx.net> wrote: >Can you give details? > >- Henry > > >"John Larkin" <jjlarkin(a)highNOTlandTHIStechnologyPART.com> schrieb im >Newsbeitrag news:nasho1do5hpdjfa6iq5tjsqadruc4taqai(a)4ax.com... >> On Fri, 25 Nov 2005 10:52:26 +0100, "Frithiof Andreas Jensen" >> <frithiof.jensen(a)die_spammer_die.ericsson.com> wrote: >> >> > >> >"Henry Kiefer" <otc_friend(a)gmx.net> wrote in message >> >news:4385b3b1$1$27887$9b4e6d93(a)newsread4.arcor-online.net... >> > >> >> Do you know of other interesting devices or circuits good for misuse? >> > >> >LED's work both ways, as a light emitter and a photodiode. >> > >> >> And optocouplers can do interesting things: >> >> Very simple high-voltage opamp, up to 400 volts p-p. >> >> Isolated totem-pole driver, from a few volts up to 400. >> >> Current limiter. >> >> Low-leakage diode, sort of like an LED painted black. >> >> John >> > I posted some opamp schematics to abse a while back. I guess I could do it again if they're no longer available. The others chould be fairly obvious. John
From: Martin on 26 Nov 2005 21:54 Am 25 Nov 2005 06:28:21 -0800 schrieb <skavanagh72nospam(a)yahoo.ca>: > As an addition to the various mentions of common diodes as varactors > there is a well publicized British design for a frequency tripler that > will put out 2 watts at 1.3 GHz and uses five 1N914's in parallel. > > I once built an HF transceiver that used CMOS logic chips for all > functions except an audio low noise amp and a voltage regulator...with > further thought those two could likely be done with CMOS logic too. > At least the audio amp, this is nice to build with some Inverters (4069) with resistive Feedback. -- Martin
From: Boris Mohar on 26 Nov 2005 21:40
On Sat, 26 Nov 2005 15:41:27 -0800, John Larkin <jjlarkin(a)highNOTlandTHIStechnologyPART.com> wrote: >On Fri, 25 Nov 2005 10:52:26 +0100, "Frithiof Andreas Jensen" ><frithiof.jensen(a)die_spammer_die.ericsson.com> wrote: > >> >>"Henry Kiefer" <otc_friend(a)gmx.net> wrote in message >>news:4385b3b1$1$27887$9b4e6d93(a)newsread4.arcor-online.net... >> >>> Do you know of other interesting devices or circuits good for misuse? >> >>LED's work both ways, as a light emitter and a photodiode. >> > >And optocouplers can do interesting things: > >Very simple high-voltage opamp, up to 400 volts p-p. > >Isolated totem-pole driver, from a few volts up to 400. > >Current limiter. > >Low-leakage diode, sort of like an LED painted black. > >John A latch. -- Boris Mohar |