Found in an American circuit manual from the 1970s, this circuit can use any general-purpose transistor. The operating frequency range is from 600 to 4000 Hz.
This circuit is from the Linear Applications Handbook of the National Semiconductor of 1994. The...
We found this circuit in the National Semiconductor Linear Applications Handbook of 1994. The...
This Japanese commercial medium and short-wave radio uses 7 transistors and tunes the range from...