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.
The load used in this experimental circuit is a small incandescent lamp but it can be replaced by...
This oscillator produces a sawtooth and square signals in the low frequency range. Other...
We found this circuit in a documentation from the 50's. The transistors are germanium types. The...