Metronome using operational (CB22060E)

We found this circuit in an English publication. The transistor can be BC549, and the power supply can be between 5 and 9 V.

Conductance Adapter for Multimeter (CB26013E)
With this circuit it is possible to add a conductance scale to a common multimeter. The circuit was...
Electronic Cigarette Lighter (CB4301E)
With a touch of S1 this circuit keeps a small strand of nichrome warm enough to light a cigarette....
MUSBR Rugged Connectors for USB 3.0 - Amphenol
Mouser Electronics has in stock the MUSBR robust connectors for USB 30 applications from Amphenol. These...