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.
We found this circuit in an old European documentation. The operational amplifier that is not...
This circuit can provide constant currents adjustable between 1 and 10 mA. The transistors can be...
We found this circuit in a 1973 publication. The circuit lets frequencies below 480 kHz pass...