This battery-powered micropower supply was shown in Radio Electronics magazine in 1991. The maximum current is 170 mA. and the integrated circuit is the MAX655 from Maxim.
When the sensor of this circuit is cut for a moment, the second 555 produces a tone for a time...
Using the 723 integrated circuit, this power supply has the voltage determined by R2 and R3, which...
This circuit was found in the ON Semiconductor's Thyristor manual of the 1980s. The high quality...