Making Magnetic stripe reader circuit using BD328

Making Magnetic stripe reader circuit

Making Magnetic stripe reader circuit

Making Magnetic stripe reader circuit using BD328

Making Magnetic stripe reader

R1,R3 1M 1/4W Resistors
R2,R4 47K 1/4W Resistors
R5 330K 1/4W Resistor
R6,R7 68K 1/4W Resistors
R8 180R 1/4W Resistor
R9 100R 1/4W Resistor
C1 470pF 63V Ceramic Capacitor (See Notes)
C2 10nF 63V Polyester or Ceramic Capacitor
C3 100F 25V Electrolytic Capacitor
C4,C5 100nF 63V Polyester or Ceramic Capacitors
C6 1F 63V Polyester, Ceramic or Electrolytic Capacitor
D1 5 or 3mm. Red LED
Q1,Q2,Q3 BC549C 25V 100mA NPN High-gain Low-noise Transistors
Q4 BD328 30V 800mA PNP Transistor
L1 700 turns on a 10mm. diameter, 10cm. long ferrite rod.
Enameled wire diameter: 0.2mm.
The tap is made after 350 turns, i.e. at the center of the winding
BZ1 Piezo sounder (incorporating 3KHz oscillator, optional, see Notes)
RL1 5V DIL Reed-Relay SPDT or DPDT (Optional, see Notes)
B1 3V Battery (2 x 1.5V AA, AAA or AAAA Cells in series or 1 x 3V Lithium Cell)