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Electronics

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PICKINI V4 schematic with automatic calibration

• This is version 4 of the PICKINI detector.
  This version is built around the 16F1824 Microchip microcontroller that runs internally at 32 MHz.
  The detector has no adjustments, it is self-calibrating after power up.
  
  
• Single sided PCB     [54 x 100 mm] [2.0 x 3.9 inch]


• Schematic diagram  


• Monochrome PCB picture as PDF - component side  


• Eagle schematic file


• Eagle board file


• Gerber files




• Parts list

C1	10µF / 25V
C2	470µF / 25V
C3	100n cer
C4	100µF / 25V
C5	100n cer
C6	2200µF / 25V
C7	10µF / 25V
C9	10µF / 25V
C10	4p7 cer
C11	100n cer
C12	10µF / 25V
C13	10µF / 25V
C15	10µF / 25V
D1	1N4148
D2	1N4148
IC2	78L05
IC4	LM318N
Q1	IRF740
Q2	BS170
Q3	BC549B
R1	1K
R2	470E
R3	220E
R4	1M
R5	10E
R6	2K2
R7	2K2
R8	33K
R9	10K
R10	4K7
R11	1K
R12	8K2
R13	10E
R14	10E
R15	10K
R16	1K
R17	1K
R18	1K
R19	10E
R20	47K
R21	10E
R22	10E
R23	2K2
R24	10E
U1	PIC16F1824
X1	2Pin screw header
X2	3Pin screw header
X3	3Pin screw header
X4	2Pin screw header
X5	3Pin screw header











• DC voltages


All voltages measured with a battery voltage of 12.0V:

U1 - PIC16F1824
PIN 1 : 5.0V
PIN 2 : 2.7V
PIN 3 : 1.2V - sensitivity potmeter
PIN 4 : 5.0V
PIN 5 : 4.7V
PIN 6 : 0.1V
PIN 7 : 0.0V
PIN 8 : 3.7V
PIN 9 : 3.7V
PIN 10 : 2.7V
PIN 11 : 0 ..5.0V - audio
PIN 12 : 2.8V
PIN 13 : 2.0V
PIN 14 : 0.0V

IC4 - LM318 opamp
PIN 1 : 9.5V
PIN 2 : 6.8V
PIN 3 : 6.8V
PIN 4 : 0.0V
PIN 5 : 4.8V
PIN 6 : 7.4V
PIN 7 : 11.9V
PIN 8 : 1.4V








• PCB pictures







Flyback pulse waveform at pin 9 of the PIC16F1824

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PICKINI V4 home