Based on an OTA LM3600 operational amplifier, this circuit was found in the July 1988 issue of Radio Electronics magazine. The range is 6 Hz to 6 kHz and can be changed.
The CMOS TLC555 [equivalent to the bipolar 555] can be used as a monostable in the configuration...
This alarm circuit has a trigger delay system. The circuit was found in a Popular Electronics of the 90s....
We found this circuit in an Electronics Now from the 1990s. The circuit crashes when light strikes the...