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I2c bit banging, AT89C55WD, EEPROM BL24C04 interfacing
1. I am using AT89C55WD(40 pin DIP), with 12Mhz crystal. Have to interface BL24C04 with it.  2. System is +5V powered & I have made bit banging code in C for it. I have...
Saturday, 16 April 2016 - 15:56
PWM Noise/whine while on motor; why human ear hear them
When I drive motor with PWM from MCU I heard a whine sound. Several people suggest to increase the PWM freq above audible range of human i.e 20Khz. But one thing I dont understand...
Wednesday, 13 April 2016 - 05:14
Motor keep on rotating for long time even if power off/motor pins short
1. I have purchaes a motor from local market. It don't have any part number on it(scratched out). Local market person syas it was used in earlier walkman. On internet I had...
Friday, 8 April 2016 - 09:13
Uart bit banging code
1. I have a application in which uart is done by software since it has only one uart & it is used for another purpose. MCU is 16Mhz with 62.5ns instruction time. Goal is to...
Thursday, 7 April 2016 - 01:54
Why fuse always placed on line not on neutral, 2 pin plug
1. I have seen some people recommended to always place to place fuse on line and not on neutral (220Vac,50Hz). I have application which has two pin plug which is plugged into main...
Tuesday, 29 March 2016 - 05:55
Snubber circuit required opto-isolated triac?
1. i have a application in which MCU(+5V) is driving MOC3021 which in turn on/off triac. Load is 100% resistive. I have checked Max load current by plugging it directly to ac, it...
Monday, 28 March 2016 - 05:00
Selecting right components for capacitive supply
This post is continuation to this( https://www.avrfreaks.net/forum/c... ) Ckt is attached.   1. I have 1uF cap as in attached picture. Purchased it from local market. I have...
Saturday, 26 March 2016 - 07:26
Audible noise in dc motor
1. I have a simple application in which three dc motors are controlled by MCU with a mosfet. Motor is 12V dc motor & load is small robo tyre as in attached video. This is not...
Monday, 21 March 2016 - 08:24
Replace Schottky with Mosfet
1. I have a application in which I have schottky connected at input. At input a solar panel is connected & at output battery is connected along with charge controller....
Saturday, 19 March 2016 - 07:57
Capacitive transformerless supply with zero cross detect
In one of application, I need a capacitive power supply with zero cross detect & output of +5Vdc & 50mA. I am reading AN954(attached) based on which I have derived the...
Friday, 11 March 2016 - 09:13
What is bulb type called in attached pic
1. In attached pic what is this bulb. In circuit it is directly connected to 220Vac manis via a 470k resistor as you can see pic. It has two filaments is it as you can see. What...
Sunday, 6 March 2016 - 14:44
Selecting fuse which do not burst like glass fuse
I have 220Vac/50Hz application which require a fuse in series in case of overcurrent. Earlier I was using glass fuse. But I have noticed whenever it blows it goes bang. I dont...
Friday, 4 March 2016 - 16:27

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