We found this configuration in a 1990 Poptronics. The circuit can be powered by voltages between 6 and 15 V, changing the resistors in series with the LED. The frequency is set at R7.
We found this circuit in an American documentation from the 90's. The circuit can be assembled with a...
This circuit was obtained from an American documentation from the 50's. It is a Hartley oscillator that...
I found this circuit in an English publication of 1989. This configuration can be mounted with...