Latching relay (CB25722E)

The figure shows how to connect a relay to obtain the latch effect. The circuit is from an Electronics Now from June 1994.

Robot Voice (CB4410E)
We find this microphone voice effect in 1992 documentation. The vibration of the relay contacts...
Signal Follower 4001 (CB5890E)
We can also use the 4011 on this CMOS circuit that makes use of a crystal headset. The power...
Voltage Controlled Oscillator (CB20115E)
We found this circuit in documentation from the 1980s. The integrated circuit used is uncommon today,...