This circuit is from a 1968s Motorola documentation. The load can range from 10 to 100ohm and the transistor supports a modern equivalent such as 2N2222 or BD135.
The circuit is from the 1994 National Semiconductor Linear Applications Handbook but can be...
This circuit found on a William Sheets can be used with a headphone or external amplifier. The...
Found in RCA documentation from the 1970s, this circuit uses currently unusual integrated...