We found this circuit in a 1980s publication. The circuit, however, makes use of common components even today, including the unijunction which may be 2N2646. The power does not need to be symmetrical and the voltage can be between 9 and 12 V.
This circuit is from an 1977 American publication. The coil consists of 30 + 70 turns of 28 AWG...
LEDs are diodes and can be tested with a simple configuration that allows the display of its...
This circuit using components that are still common in our market was found in a 1987...