2 lithium batteries charger (CB9128E)

This charger was found in an 80's Electronic Design. The circuit uses components from that time. Equivalents can be tested.

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High Input Impedance LM3900 Amplifier (CB14183E)
The figure below shows an AC transconductance amplifier with the National Semiconductor LM3900. The...
Guitar Fuzz (CB26213E)
This common circuit using operational amplifiers was found in the 1993 issue of Radio Electronics Special...
Voltage Switch with Diac (CB13362E)
This circuit provides a voltage at the output only when the input voltage exceeds a value that...