Burst generator (CB21067E)

Found in American documentation from the 90s, this circuit generates sound bursts according to the digital control.

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Operational VCO (CB13131E)
The circuit shown in the figure uses two of the four operational amplifiers found on the LM324...
Integrated Tone Control (CB14793E)
We found this circuit in a publication from the 1980s. The circuit can still be easily implemented...
Light Relay (CB473)
In this circuit the relay triggers on when light falls onto the sensor, a common LDR. Power supply...