[sdiy] 74xx series - what to do with them?

[Ingo Debus]

Am 21.11.2011 um 11:17 schrieb Nils Pipenbrinck:

> On 11/17/2011 11:34 PM, Terje Winther wrote:
>> Anyone know any interesting synth circuits using 74xx series chips?
> 
> You could build a suboctave divider if you really want to, and they are
> fine for generic logic tasks.

Do you have some 74150? You could clone the touch keyboard of the EMS synthi :-)

Another synth circuit that used a TTL chip (a 7413 schmitt trigger AFAIR) is the elektor Formant VCO.

I always liked one of my first noise-makers that was just a 74121 non-retriggerable monoflop fed with a square wave. Turning the knob for the mono-time gave me both PWM and frequency division.

Ingo