We found this circuit in a 1986 documentation. It uses only LEDs, batteries, resistors and the power supply which can consist of 4 batteries or a 9V battery. The basic circuit uses two-color LEDs.
This sweep oscillator was found in 1980s American documentation and can be assembled with current...
The tone produced by this circuit attract fishes. The circuit is installed into a small can and...
This differential amplifier, found in a 1964 Electronic Design, has a gain of 30. The setting can be...