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.
I found this simple circuit an English magazine from 1984. The circuit can be easily assembled by simply...
This circuit, found in a 1978 publication, converts 5 V into a symmetrical 15 V output under low...
In the figure we have an inductance bridge for values between 1 and 30 uH at a frequency of 5 MHz....