Adding a sub oscillator to the Teisco 60F

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wahee
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Adding a sub oscillator to the Teisco 60F

Post by wahee » Sun Jan 10, 2021 2:13 pm

hi

I have successfully made a very simple 4024 based sub oscillator and have tested it on a scope and it does indeed put out division of the inputted square wave.

I wanted to add this to my 60f. I have successfully located the square wave output and the 4024 outputs a divided signal.

I have been having issues trying to inject the signal into the synth, and also how to mix it with the existing signal. After killing one 4024 I though it was better to stop and really get this right.

Attached is the schematic for the 110 model, 2 oscillator big brother of the 60f. I thought if I could inject at the filter it may be the right thing.

Just wondering if anyone more knowledgeable than me would have any insights

many thanks
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Re: Adding a sub oscillator to the Teisco 60F

Post by guest » Sun Jan 10, 2021 9:01 pm

replicate the circuits in the mixer section. add a resistor from the 4024 output to the top of a 50k or 10k pot, and then take a 100k from the wiper of that put into the mixer.
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wahee
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Re: Adding a sub oscillator to the Teisco 60F

Post by wahee » Mon Jan 11, 2021 2:30 pm

guest wrote:
Sun Jan 10, 2021 9:01 pm
replicate the circuits in the mixer section. add a resistor from the 4024 output to the top of a 50k or 10k pot, and then take a 100k from the wiper of that put into the mixer.
hi managed to get it sorted. Did as you said.
I had to use quite a high value pot 500k. Then a 100k in and 47k out. Gave satisfactory levels.
The pot had an integrated switch so I can turn off the sub if required, sounds great

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Re: Adding a sub oscillator to the Teisco 60F

Post by guest » Mon Jan 11, 2021 4:53 pm

sounds great!
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wahee
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Re: Adding a sub oscillator to the Teisco 60F

Post by wahee » Wed Jan 13, 2021 7:17 am

guest wrote:
Mon Jan 11, 2021 4:53 pm
sounds great!
cheers, it's actually a decent mod to do
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