This 1950s audio amplifier uses output tubes of type 1625 in its output stage. The Class B circuit provides a few watts of power and uses transformers that are not readily available today.
This is a conventional FM micro transmitter circuit already used several times on this site. The...
In the old original version of this circuit from 1989, the LED is common (we recommend 330-ohm...
Found in National Semiconductor documentation, this logarithmic meter is powered with a voltage of only...