This circuit divides the voltage of a 12 V battery by 2 and can supply currents up to 1 A at the lowest voltage output. The integrated circuit used is not very common today.
This preamp version uses BC109 transistors that are older versions of the current BC549 in plastic...
This circuit separates the bass from the treble in an audio signal. The circuit is from a Hands On...
This circuit is from the 1983 Intersil manual. The display is a 4.5-digit LCD, and the power...