We found this circuit in a 1977 Timers Cookbook. The circuit uses common components to divide a 1 kHz signal by 2. The output has an amplitude of 2 Vpp.
The sensor for this alarm is an LDR and it consists of an oscillator that goes into action when...
This circuit shows how to control an astable configuration using the 555 IC. The control signal is...
This circuit was suggested by Radio Electronics magazine in September 1983 in the new ideas...