This 1965 Philips circuit uses old company transistors like the BFY51 and BFY50. The circuit is powered by 12 V and the power gain is 8.9 dB.
We found this FET-stabilized circuit in an American documentation from the 90s. With the values of the...
This circuit with a bargraph scale was found in a 90s Popular Electronics. The circuit measures...
The presented circuit uses an LM3900, transconductance operational amplifier. It was found in the...