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Portable Low Frequency square wave generator circuit - Solved - page 3
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Laszlo:
In case anyone is still watching this thread, or ever needs a solution for a problem similar to this question. I've built these circuits but for one reason or another I ended up making up my own. I've tested it and it does work on the field. Please see the drawing below in case you want to build one as well.

The duty cycle is in between 49-54%. Max frequency is depending on the pot you are using on the IC side.
The input voltage depends on how you set the 5k pot on the voltage regulator. You should ensure that the output on the regulator never goes higher than 16V (unless you like blowing things up)
Mine works with two 9V batteries in series.

Thanks for all the input.
StillTrying:

--- Quote from: Laszlo on January 26, 2019, 08:22:34 pm ---output a 12Vp-p square wave from 1 to 1000Hz
--- End quote ---

How do you get square waves passed the 0.1u and 22k.
Laszlo:
The reason why that capacitor is there is because the rig I'm connected to keeps loosing the signal unless the output goes through the series capacitor.

I just tested it again and it's the same. Probably because it needs less dc component in the signal?

Do you think there is something wrong with the circuit?

Cheers,
Laszlo.

Sent from my S60 using Tapatalk

Simon:
Yes there is a problem there. Try it in LTSpice and see what happens but with a series capacitor you will get a pulse on each transistion but then nothing for the rest of the duration until it changes state again.
Simon:
this is what you get at 1Hz
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