This circuit was found in an Electronic Experimenter Handbook from the 90's. The coil can be formed by 4 turns of wire 28 with 0.5 cm diameter without core for the FM band.
This “compandor” circuit has the opposite effect of CB15195E. The LS150 is not common today and...
This circuit was obtained from an American documentation from the 1980s. The T1 triggering...
This circuit is suggested by the Linear Applications Handbook of National Semiconductor, being used...