We found this circuit in a Texas Instruments documentation from the 80s. The circuit uses simple power source and the frequency depends on C1 and R1 basically.
This 27mW transmitter was found in documentation from the 60's. The transistor is germanium of the...
Pulses in sequence 1 to 10 are produced by this circuit. The pulses can be used to drive output...
This optical tachometer with LASCR was found in a 1965 General Electric documentation. The diode at...