Pulse-Generator & Signal-Tracer with BC547,BC557

Dual-purpose test-instrument
Very simple circuitry, 1.5V Battery-operated

Parts:

R1__________________1M 1/4W Resistor
R2,R4_______________2K7 1/4W Resistors
R3________________150K 1/4W Resistor

C1__________________2n2 630V Ceramic or Polyester Capacitor (See Notes)
C2,C3_______________4n7 63V Ceramic or Polyester Capacitors

D1_______________1N4148 75V 150mA Diode

Q1________________BC547 45V 100mA NPN Transistor
Q2________________BC557 45V 100mA PNP Transistor

SW1________________SPST miniature Slider Switch (See Notes)

J1_________________Stereo switched 3mm. Jack socket (See Notes)

Probe______________Metal Probe 3 to 5 cm. long

Clip_______________Miniature Crocodile Clip

B1_________________1.5V Battery (AA or AAA cell etc.)

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