This small amplifier with the fraction-watt LM4862 was found in the November 1999 issue of Electronics Now. The power supply is low voltage.
This powerful inverter provides a high-quality sine wave signal. I found it in a Radio Electronics issue...
We found this circuit in a Popular Electronics of the 90s. The circuit still uses light bulbs, but...
The relay used in this circuit must be of the sensitive type with a trigger current less than 10...