20 kHz ring counter (CB6138E)

We found this circuit in an old General Electric documentation. In fact, PUTs are not common components today. The circuit is valid as a reference.

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Limiter with 741 and Zener Diodes (CB12178E)
This reaper has the signal limit determined by the zener voltage. We found this circuit in a 1980...
Step-adjusted power supply (CB8895E)
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VLMU3510 365 130 High Power Ultraviolet LED (COM118E)
September 2016 - It can be purchased from Mouser Electronics the new ultraviolet high power LEDs...