Rangkaian Detektor Signal AF/RF

type='html'>

The following circuit of special functions to detect the presence or absence of signal AF / RF. This circuit is very simple so as to make it requires a relatively low cost. Detektor Signal AF/RF circuit based an audio amplifier and a loudspeaker with a switch input to the AF and RF signal. The whole device can be made as small as possible so that it can be included in a container to keep the peace.

Audio amplifier section in this series created by IC TDA 2822M, with a low-power stereo amplifier in 8-pin mini-DIP. This IC is used as a bridge cofiguration to minimize output power up to 250 mW, the loudspeaker is in use 4 ohm, 500mW. Current required is less than 10mA with a 3V battery voltage.

Skema Rangkaian Detektor Signal AF/RF

List Component

R1 : 22K
R2, 3, 4 : 4K7
C1 : 1n
C2, 6, 7 : 0,1uF
C3, 4 : 10uF/16V
C5 : 0,01uf
D1 : OA79
VR1 : 22K
IC 1 : TDA2822M
LS : 8 ohm 500mW

When the switch in the AF position, Signal input audio input working on AF amplifier (IC 1 pin 7) via a capacitor C2 and Potentiometer VR1. Capacitor C2 is always holding the input amplifier of the DC voltage and make it happen in the audio signal frequency. Input signal IC 1 can be arranged with the help of potentiometer VR1.

When switch on the RF position, the detector and demodulator circuit formed by capacitor C1, diode D1, and resistors R1 and R2 are connected to the input rangakaian. When the audio signal is detected it will be significantly strengthened in kerangkaian for. Signal detection is done by plugging in tactile (probe) on the legs of the existing components.

Rangkaian Audio Signal Injector|Tracer

type='html'>

This circuit can be used as a signal injector or signal tracer. This circuit is very helpful in trouble shooting audio circuits, when you need to test a circuit by injecting a signal and observe the output (by watching the oscilloscope or by hearing the loudspeaker ), or by tracing some points inside the circuit when an audio signal is applied to the input.

Skema Rangkaian Audio Signal Injector|Tracer

The circuit uses supply from 9 volts battery. An alligator clip is recommneded for the ground probes, so you can works with one hand to hold the board, and the other hand to target the test probes. The SPDT switch connected to the transitor and the earpiece is used to select the function, whether as a signal or a signal injector tracer.

Transistor 2n3904

This transistor is designed as a general purpose amplifier and switch. The useful dynamic range extends to 100 mA as a switch and to 100 MHz as an amplifier.

Transistor 2n3904 Pin

Absolute maximum rating

• Collector-Emitter Voltage 40 V
• Collector-Base Voltage 60 V
• Emitter-Base Voltage 6.0 V
• Collector Current - Continuous 200 mA
• Operating and Storage Junction Temperature Range -55 to +150 °C

Rangkaian 8038 frequency | Signal Generator

type='html'>

frequency | Signal Generator circuit is a circuit that produces a variety of different waveforms at a desired frequency. It can generate Sine waves, Square waves, Triangular and Sawtooth waveforms as well as other types of output waveforms. There are many "off-the-shelf" waveform generator IC's available and all can be incorporated into a circuit to produce the different periodic waveforms.

Skema Rangkaian 8038 frequency | Signal Generator

IC 8038 Pinout

One such device is the 8038 a precision waveform generator IC capable of producing sine, square and triangular output waveforms, with a minimum number of external components or adjustments. Its operating frequency range can be selected over eight decades of frequency, from 0.001Hz to 300kHz, by the correct choice of the external R-C components.

The frequency of oscillation is highly stable over a wide range of temperature and supply voltage changes and frequencies as high as 1MHz is possible. Each of the three basic waveform outputs, sine, triangle and square are simultaneously available from independent output terminals. The frequency range of the 8038 is voltage controllable but not a linear function. The triangle symmetry and hence the sine wave distortion are adjustable.