LM386 Audio and RF Probe Amplifier

The Signal Tracer RF and audio probe using Lm386 integrated circuit is geared towards maintaining preamplifier, power amplifiers and even RF devices.
As a probe of audio signal and RF, can make maintenance of equipment such as amplifiers, preamplifier, radios, car audio, transmitters, recorders, televisions and more. The basic operation is to follow the audio signal to a point where it is not available or is undergoing any changes that should not occur.

Circuit LM386 Audio and RF Probe Amplifier schematic

Suggested printed circuit board for mounting of the circuit

Circuit LM386 Audio RF Probe Amplifier PCB

Circuit LM386 Audio RF Probe Amplifier PCB

Circuit LM386 Audio RF Probe Amplifier PCB silk

List of material for assembly of the circuit With Lm386

Resistor’s 1/4 Watt 5%

R1      470K –      Yellow, Violet, Yellow, Gold

R2      10 –           Brown, Black, Black, Gold

Capacitors

C1,C6         470µF/25V –    Electrolytic Capacitor

C2                 100nF –            Ceramic capacitor

C3, C5, C8 10µF / 25V –    Electrolytic Capacitor

C4                 270pF –            Ceramic capacitor

C7                 47nF –              Polyester or Ceramic Capacitor

Semiconductors

D1 1N4004 or equivalent – silicon diode rectifier

D2 1n34 or equivalent – Germanium Diode

IC1 LM386N-1 – Integrated circuit audio amplifier – Dil8

Connectors

IN         Connector for RF  or Audio signal input

OUT Connector for speaker

Miscellaneous

DC_9V          Jack to power, connect the external power supply

P1 47K –       potentiometer

BAT 9V    Volt battery

Solder, wire, PCB, box, test lead, etc..