This circuit multiplies the input voltage by 3 and can work with up to 12 V input. The current is a few mA. We found it in the Radio Electronics magazine of December 1992.
This circuit consists of a bass filter that can be used as a subwoofer in a sound system. The...
This circuit is from an 80's documentation. The integrated circuit is from the time and the...
This is a general purpose pramplifier launched in Brazil by Philips in the years 70. The BC549 is...