Unusual functions of cheap parts
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From: CA on 24 Nov 2005 13:20 >Do you know of other interesting devices or circuits good for misuse? The LM317 as a radio transmitter http://web.telia.com/~u85920178/tx/317-tx.htm
From: John Larkin on 24 Nov 2005 13:22 On Thu, 24 Nov 2005 18:30:06 +0100, Jorgen Lund-Nielsen <jorgen.lund-nielsen(a)xxxxxxxxxxxxdesy.de> wrote: >Henry Kiefer 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 > >Tuner Switching Diodes like the european BA244 (NOT PIN-Diodes!) work >well as medium fast Step Recovery Diodes. > >Jorgen I know a guy who uses surface-mount resistors as explosive detonators. John
From: Jim Thompson on 24 Nov 2005 14:11 On Thu, 24 Nov 2005 09:40:27 +0100, "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. [snip] > >Best regards - >Henry > That's an interesting use of the 1N4007. I've not tried that, what kind of off capacitance do you get? ...Jim Thompson -- | James E.Thompson, P.E. | mens | | Analog Innovations, Inc. | et | | Analog/Mixed-Signal ASIC's and Discrete Systems | manus | | Phoenix, Arizona Voice:(480)460-2350 | | | E-mail Address at Website Fax:(480)460-2142 | Brass Rat | | http://www.analog-innovations.com | 1962 | I love to cook with wine. Sometimes I even put it in the food.
From: John Larkin on 24 Nov 2005 14:42 On Thu, 24 Nov 2005 18:20:57 GMT, "CA" <no(a)mail.com> wrote: >>Do you know of other interesting devices or circuits good for misuse? > >The LM317 as a radio transmitter > >http://web.telia.com/~u85920178/tx/317-tx.htm > Cool. 3T regulators, 317 and LM1117 types, can be neat power amps, for driving unipolar loads like motors and such. Sort of a follower with a largish offset. Hmmm, an LM1117 followed by a monster darlington becomes a super-follower with roughly zero offset. John
From: John Larkin on 24 Nov 2005 14:44
On Thu, 24 Nov 2005 18:30:06 +0100, Jorgen Lund-Nielsen <jorgen.lund-nielsen(a)xxxxxxxxxxxxdesy.de> wrote: >Henry Kiefer 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 > >Tuner Switching Diodes like the european BA244 (NOT PIN-Diodes!) work >well as medium fast Step Recovery Diodes. > Tell me about it. I tried some pins to see if they would snap, and they turn out to have incredibly mushy reverse recovery, Slop Recovery Diodes. I'll have to try the varicaps. John |