This sensor circuit for currents of the order of nanoamperes was found in an American documentation from the 1980s. The components are from that time.
The figure shows an application of the LM377 in a small inverting stereo amplifier with output...
This 500 MHz oscillator has an output power of 1 W when powered by a 20 V source. The circuit was...
We can use this amplifier with low impedance headphones with good performance. Possible...