This circuit is from 1973 documentation. The transformer has 500 mA of current and the transistor can be the TIP32 mounted on a heat radiator.
This amplifier has a few Watt output, using old transistors. The speaker is 45 ohms, but with...
Found in the July 1994 Electronics Now magazine, this circuit drives a relay up to 12 V depending on...
Found in documentation from the 1980s, this circuit can generate signals in a range that reaches a few...