This circuit was found in a Ferranti documentation from 1969. The transistors are common types of the company at the time. Smaller equivalents may be used. The output power is of the order of 150 mW.
The 4518 can be cascaded to count to values higher than 10. The output EN of this device can be...
This oscillator uses a ceramic resonator to determine the frequency. This kind of element is found...
This small transmitter appeared in the March 1989 issue of Radio Electronics magazine. The...