This modulator circuit was found in an American documentation from the 90's. The circuit uses a low power LASER diode. Power is supplied with 12 V.
This small telephone transmitter uses a telephone capsule as a microphone. The L1 coil has 4 to 5...
This circuit was found in an American documentation from the 1980s. The sensitivity ranges from...
This circuit produces a sinusoidal signal whose frequency can be calculated using the formula next...