Intelligent battery charger (CB7130E)

Suggested by Radio Electronics from the 90s, this circuit is suitable for NiCAd batteries with a low battery indicator and a charge indicator.

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Audio Limiter (CB948E)
We got this circuit in a publication of 1987. This is an audio limiter, a circuit that cuts peaks...
Optical communication receiver (CB7850E)
This is the receiver for the previous circuit. The audio amplifier supports equivalents. The...
Bridge Crystal Oscillator (CB6520S)
We find this circuit in an 80's EDN. The circuit can be used with equivalent operational,...