Found in Popular Electronics from the 90s, this circuit generates signals in a frequency range set to R7 and basically determined by C1. Operational and equivalent transistors can be used.
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...