Burst generator (CB21067E)

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

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Balance Control (CB6310E)
This balance control for the channels of a stereo system was found in a 1969 Mullard...
Electronic Bongos (CB23959E)
The article that teaches the assembly is from a Radio Electronics issue from July 1969. The...
Undervoltage alarm (CB22186E)
Found in old English documentation, this circuit is still current. The circuit trips with a sound...