This input circuit for meters, which can also be used as a shield, is intended for operation with very low frequency signals. The power supply must be symmetrical.
This circuit uses a heated filament as a sensor. With the air current it changes resistance, and...
Using a pair of CK722s, this booster step of a few milliwatts of power was obtained in a 1960...
In the figure we have the way to trigger a 7555 CMOS monostable with a positive pulse. The time...