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Sloppy Schematic Questions

bigkim100

Apr 17, 2013
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Ok, find attached an amazingly sloppy schematic that was sent to me.
My questions are:
1- What the hell are the 4 diodes doing??
2- Overall, its a pretty simple generator, but do you think it works, as it stands??

As per usual, thank you for any help, in advance

Steve Kim Schematic for PCB.jpg
 
Last edited by a moderator:

Kiwi

Jan 28, 2013
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As Bertus explained above.

I would just put a diode inline in the positive supply line.
Current will only flow to the circuit if polarity is correct.
The diode will block current if polarity is wrong.
I have found this method more reliable than fitting crowbar diodes across the supply lines.
 

Audioguru

Sep 24, 2016
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The diodes labelled D1 to D4 chop off the peaks of the triangle waveform creating a horrible looking "sinewave".
The lousy old LM324 opamp produces crossover distortion and noise. It has a very poor high frequency response.
 

Harald Kapp

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Look up XR2206. This vintage IC is still available and generates squares, triangular waves and sinusoidal waveforms.
A complete circuit is presented e.g. here.
 

bertus

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Nov 8, 2019
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Hello,

The diodes D1 to D4 are marked as 1N4004, wich are quite common.
There is a series from 1N4001 to 1N4007 depending on the reverse voltage.
Even a simple diode as the 1N4148 will do in that position.

Bertus
 

Attachments

  • 1N400X.pdf
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  • 1N4148_1N4448.pdf
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bigkim100

Apr 17, 2013
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I dont know how, but when I looked that diode up, it came up as a 20v ZENER........ DUUUUUUUHHHHHHHHHH!
 
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