This is a design circuit for sensing the signal AF or RF. This circuit is very easy to built and is cheaper cost. This circuit is work with based TDA2822. Basis using a series of audio amplifier and loudspeaker to the input signal to switch to the AF and RF. The entire device can be made small so that it can be inserted in the vessel to maintain security. Here’s the circuit schematic diagram.
Audio amplifier section in this series created by IC TDA 2822M, with a low power stereo amplifier in 8-pin mini-DIP. IC is used as a bridge configuration to minimize the output power up to 250 MW, the loudspeaker is in use 4 ohm, 500mW. Cash needed less than 10mA with a 3V battery voltage. When the position switch is in selector AF, signal audio input is working on the input AF amplifier (IC 1 pin 7) through the capacitor C2 and Potentiometer VR1. Capacitor C2 is always holding of the input DC voltage from the amplifier and built in the audio frequency signal. Input signal IC 1 can be arranged with the help potentiometer VR1.
When the selector switch on the RF position, a series of detector and demodulator formed by capacitor C1, diode D1, and resistor R1 and R2 which are connected to the input circuit. When the audio signal is detected it will be significantly strengthened to enter the circuit. For sensing the signal is done with the touch (Probe) in the foot-foot component that is.
Audio amplifier section in this series created by IC TDA 2822M, with a low power stereo amplifier in 8-pin mini-DIP. IC is used as a bridge configuration to minimize the output power up to 250 MW, the loudspeaker is in use 4 ohm, 500mW. Cash needed less than 10mA with a 3V battery voltage. When the position switch is in selector AF, signal audio input is working on the input AF amplifier (IC 1 pin 7) through the capacitor C2 and Potentiometer VR1. Capacitor C2 is always holding of the input DC voltage from the amplifier and built in the audio frequency signal. Input signal IC 1 can be arranged with the help potentiometer VR1.
When the selector switch on the RF position, a series of detector and demodulator formed by capacitor C1, diode D1, and resistor R1 and R2 which are connected to the input circuit. When the audio signal is detected it will be significantly strengthened to enter the circuit. For sensing the signal is done with the touch (Probe) in the foot-foot component that is.
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