Suitable for operation with high impedance microphones, this circuit was found in American documentation from the 90s. The transistor can be any general-purpose type.
We found this circuit in the October 1996 Electronics Now magazine. The circuit uses LDRs as...
This circuit was found in Intersil's 1992 documentation consisting of a test for ADc0801 and...
We found this circuit in an old publication. The ICM7556 is a dual CMOS 555. The other components are...