This amplified metronome was found in a 90s Popular Electronics. The circuit is powered by a 9 V battery but will also work with 6 V of 4 standard batteries.
This monostable circuit appeared in Radio Electronics magazine in October 1965. The circuit...
This is a simple variac type source found in the July 1962 Radio Electronics magazine. Voltage and...
April 2017 - The ADXL35x line of Analog Devices accelerometers can now be obtained from Mouser...