This circuit can generate signals of crystal multiple frequencies. The resonant circuit must be according to the desired frequency. The transistor must match the frequency.
This configuration has already been found in other manuals, as the LM117 is manufactured by...
This is the radio receiver for the previous infrared alarm radio transmitter. It contains the...
This circuit, from an old publication from the 70s, can be assembled with a 2N2646 unijunction...