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Divide power using triac ; formula ; calculation
1. I am using a pure resistive load & have to divide output power by using triac. Ckt has 220V ac 2. I have a zero crossing detector output signal at every zero so I get two...
Monday, 15 December 2014 - 10:09
Error; low cost dc voltmeter +-20V
1. I have to make a low cost dc voltmeter with range +-20V 2. I am using the circuit as attached. 3. problem is if I applu any voltage across j1 two terminals, I get correct...
Monday, 1 December 2014 - 18:17
Failed to enter programming mode
[Moved to a more appropriate forum]   1. I have AVRISPmk11 debugger with custom atmega1280 board. 2. On starting debug session I got error:     18:15:17: [ERROR]...
Saturday, 29 November 2014 - 12:49
Null detector with MCU
  Problem: 1. I have to make a null detector with MCU. 2. Input voltage maximum is 30V dc. 3. Current to detect is 1nA to 300mA. 4. Galvanometer resistor selected is 100ohm....
Thursday, 27 November 2014 - 13:41
Simple comparator not working, voltage dropped
1. I have made a simple single supply comparator, ckt is attached. 2. Mosfet I have used in N-channel , with Vgs = 4V. (part number is different as mentioned in ckt). Supply...
Tuesday, 25 November 2014 - 15:32
Noise in reading data for adc, microcontroller
1. I have to read Current transformer reading. CT has both +ve & -ve peaks so I have level shifted the value to 2.5V. As in attached circuit. 2. CT has 50Hz waveform &...
Tuesday, 18 November 2014 - 11:29
Lcd 4 bit initialization problem after MCU reset
1. I have interfaced 16x2 lcd in 4 bit mode. D0-D3 & R/w of lcd are grounded. 2. If system is power on, then lcd works properly. No issue. I have tried many times. 3. But when...
Monday, 17 November 2014 - 17:13