Found in a 90s documentation, this circuit makes use of D1, a switching diode that is uncommon today. D3 is an LED. The circuit monitors 12 V batteries.
This 1998 circuit controls the volume in a stereo system by touching switches. The circuit is for...
A 25 mVpp applied to the input of this circuit produces in the output a 1 Vpp signal. The...
The basic integrated circuits of this 1988 multimeter are no longer very common today, but if...