This high-impedance probe for oscilloscopes was found in a July 1958 Radio Electronics magazine. The circuit did not include a power supply.
This circuit was found in a Popular Electronics from the 90s. The circuit uses a general purpose...
This 2000 circuit can work with one of the many infrared remote-control transmitters described in this...
We found this amplifier for automotive use in the Philips Databook of 1990. The circuit has a...