Dear Ralph
First of all wish you and your family a merry christmas and HNY 2019.I am new to arduino, can you please help me that where to define these function in sketch and where to call these in loop function to produce the 12v for vpp, where to define the pin to which the base of the bc549 will be connected . I want to make one such programmer for me.

thanks in advance
regards.

Great idea which simply did not occur to me when I designed the board. Thank you very much for sharing!

I’ve made my own shield using ardpicprog ICSP compounding with an ISP-Header for AVR-Programming and a very proprietary programmer for AT89S51/52, AT89S8253, AT89S4051.
So thanks a lot for the great work in ardpicprog, so I have a (very low cost) shield for 3 kinds of MCU family.
But there is one thind, that I don’t understand:
Why are you using an expensive DC-DC Converter TME512 ? It is simple to create +12V using a PWM clock from Arduino together with a switched coil.

Function in Arduino sketch:

void pwm25k_init(void)
{
TCCR1A= 0; TCCR1B= 0;
TCNT1= 0;

// Nichtinverter PWM Kanal A und B; Modus 10h: Phase korrekt
TCCR1A= _BV(COM1A1) | _BV(COM1B1) | _BV(WGM11);

// Prescaler= 1
TCCR1B= _BV(WGM13) | _BV(CS10);

// Werte von 0 bis 320 werden vom PW interpretiert
ICR1= 320;
}

void pwm25k_set(unsigned int value)
{
OCR1A= value;
}

————————
// Code in setup()
// generate a 25 kHz clock output for step-up converter
pinMode(PIN_PWM25K, OUTPUT);
pwm25k_init();
pwm25k_set(55); // 25kHz using 220uF capacitor to buffer +12V

———————–
Nice greetings,
Ralph