This circuit controls a direct current heating element. Power transistors must be load dependent. The components support modern equivalents.
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...