This circuit has a gain of 6 dB for low frequencies from 85 Hz and can be used in a mini subwoofer. The circuit is from a Radio Electronics from March 1990.
This circuit was found in an Electronics World of 1969. Transistors are general-purpose types. It...
It is like to the previous circuit with a lock that keeps the LED on at the end of the timer. The...
This good quality audio amplifier with an output of about 10 W with the original transistor was...