This triac circuit was taken from an article in the July 1970 Radio Electronics magazine. Note the snubber formed by R5 and C3 for controlling inductive loads.
This antenna for the frequencies 146 or 440 MHz was found in a magazine 73 for Amateur Radio of...
This circuit produces 1 kHz square signals using the CMOS IC 4070. The frequency is given by the...
Found in a 90s PE Hobbyst Handbook, this circuit mimics the sound of a space gun. The components...