Found in an English publication from the 1980s, this circuit can be built with equivalent transistors such as the BC549. The signal must be applied to an external amplifier.
This simple circuit produces pulses delayed in times set by the resistor in series with C on the...
This circuit was published in the Ideas section of Radio Electronics magazine in August 1983. The...
In the figure we have the receiver of a sequential remote control operating at a frequency in the range of...