Based on a 555, this 80's American documentation circuit detects the voltage of a battery and can then disconnect the charger. The transistor may be a general purpose type.
Any high-gain Darlington transistor can be used on this touch circuit. The load can be formed by...
This circuit was found in a 1992 publication. Its purpose is to time the activation of a doorbell...
This small stereo amplifier is suitable for listening with low impedance headphones with excellent...