This 80's General Electric circuit is guarded by the noise-guard for operating current. The circuit has an input sensitivity of 3 pA. The font must be symmetrical.
This 1965 Philips circuit uses old company transistors like the BFY51 and BFY50. The circuit is...
This circuit is from an April 1991 Radio Electronics magazine. The circuit uses power MOSFETs and...
This small power supply for low currents (5mA) is suitable for power low-power TTL experimental circuits....