The integrated circuit used in this amplifier is not very common today. This amplifier was found in the 1977 National Semiconductor Audio Handbook. The power source must be at least 500 mA.
This circuit is from RCA documentation from the 70s. The dual-gate MOSFET is not very easy to...
Found in a Popular Electronics from the 90s, this circuit uses a double 555 to emit beeps when the...
This source, obtained in a 1973 publication, uses a low power transistor to regulate the output...