Type in the full discussion title or a part of it.
Discussion Title Created date
interrupt problem
Hey all I use following circuit It has phase,phase up and phase down that all of them will be 220V AC. but When I connect phase to 220V the phase pin the up and down pin will be...
Saturday, 21 August 2021 - 12:43
Hello all Does 74HC595 ICs need cap on RCLK (load) pin? why?
Friday, 20 August 2021 - 21:44
triac breaker insteed Contactor
Hey all, I wanna a breaker for Induction Motors (Ventilators). Is it Possible to build it by Traic instead in Contactors like this   If not why? If yes , If I use BT139 is...
Saturday, 7 August 2021 - 06:40
rotary encoder problem
Hey all, I write following code to use a rotary encoder. while(1){ // polls for turns only if (PIND.6==0) { if (PIND.7==0){ // left turn...
Thursday, 24 June 2021 - 14:22
LED problems
Hey all in the following circuit when we turn all LED one by one everything is OK but when we Turn all on by PORTC=0xff only two of them will be turn on why?
Thursday, 24 June 2021 - 09:21
making schematic from PCB
Hey all, If we have a PCB with it's Net is it possible to make it's schematic from it? with which software? How? thank you
Saturday, 22 May 2021 - 11:45
Triac switching
Hey Can any body explain me why in first picture triac switch to ON but in second is OFF?
Wednesday, 6 January 2021 - 19:43
optotriac example
Hello all can anybody explain how following circuit works? in other word Triac gate how stimulated?  
Monday, 4 January 2021 - 17:22
connect 2 AC Bridge Ground
Hey all in the following picture if we connect BR3 output to ground one of the diode bridge will be fault!! what is the problem?
Friday, 11 December 2020 - 10:26
Atmega8 MCU,QMC5883 Magnetometer,AT24C512 eeprom,ADM3485 Rs485 hangs
Hey all, I have a Board such as an Atmega8 MCU,QMC5883 Magnetometer,AT24C512 eeprom,ADM3485 Rs485 IC. reading from QMC is doing every 10ms by Interrupt pin. When I send a data to...
Saturday, 21 November 2020 - 06:44
Parallel resistor in RS-485
Hey all What is the parallel-120-ohm resistor in start and finish of a RS-485 line? if we disconnect it what will be happen? tnx.    
Thursday, 5 November 2020 - 07:46
build a voltmeter
Hey all, I wanna to build a voltmeter by atmega8A, Which circuit should I use? tnx
Sunday, 27 September 2020 - 07:23