We found this circuit in a Motorola manual. The circuit has the capacitor charging at 15 to 30 V, then discharging through the coil and generating a voltage that reaches 500 V for the spark plugs.
In the circuit of the figure, when pressing S1 the sound varies according to the value of R2 and...
This receiver for the police band, which at the time was 45 MHz, was found in a publication by...
This is the receiver circuit for the PFM (pulse rate modulation) transmitter of the previous...