This circuit for a frequency of 40 kHz was found in an old Electronic Design. There were no constructive data for the transformer used in the output.
We found this code key or coded keyboard in a publication from the 90s. The circuit uses...
With this circuit, using a single control voltage, you can increase the brightness of the lamp...
This circuit is from a 1976l filter cookbook. The circuit has a factor Q = 3, and must be supplied...