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Fun is here / Hello to everyone still visiting the site and forum
« Last post by Kunkel on December 09, 2021, 18:36:23 PM »
General Discussion / unkown electronic component
« Last post by johniee on February 01, 2018, 23:16:09 PM »
Does anyone know what is the function of electronic componenet A619N ????
Your projects / Re: overheating Circuit
« Last post by kam on December 03, 2017, 14:52:23 PM »
YES!!! In one word. 2W in such a small surface can be very very hot
Your projects / Re: overheating Circuit
« Last post by JardCrocker on November 13, 2017, 16:04:25 PM »
Hi,...i am a new user here. As per my observation you are dropping 4V between input and output, and at 0.5A that makes 2W, and that is a LOT of heat without a heatsink.At 2W without any heatsink, the die of the device will be at a whopping 155?C if your ambient temperature is 25?C, and the case will be 10?C less, but 145?C is still a nice way to burn your fingers.
General Discussion / 3 phase motor megger testing
« Last post by Greg on November 02, 2017, 04:36:42 AM »
I have a 3 phase motor   When testing with a megger do you only test from each winding to ground.
When I do a ohm meter test of the 6 wires I get a reading wirer  green 1&2.  9.7ohm       White  3&4.  9.7 ohm          Yellow  5&6   9.7 ohm readings .
This is the order in witch they wer connected to the terminal block.
When I connect any black wirer or white wirer in any order I get a ohm reading between 17 and 10 ohm  black to black or white to white black to white.
I do not under stand this layout.
Are all the wind endings going inside.
The windings do not go to earth.
Your projects / Current not stable in Voltage Divider
« Last post by ma1990 on October 27, 2017, 17:15:16 PM »
Hello! I recently built a voltage divider, and tested out resistors before soldering, which were in good condition. However, when I connect my divider to the HV supply my current seems to be unstable.

The current should read 210microA, but it keeps fluctuating between 218-219 even after 10 minutes of voltage running through it. I have re-tested the resistors still connected to the board with the use of a multimeter and they all still give me their correct value. I even added extra solder support to the resistors thinking that one might be lose but I have had no luck in stabilizing it.
Any suggestions?

I would greatly appreciate it,
General Discussion / Re: 555 Breathing (Pulsing) LED
« Last post by urameshix on October 12, 2017, 15:30:11 PM »
Good Morning all,

I have exactly the same problem. It lights up once, and then stays off all the time.
I checked the voltage in the capacitor, and it's changing due to 555, but led does not light up.

I also tried to connect directly the led with a resistor to pin 3, and it blinks well.

Video here: https://youtu.be/XInVuIA9g8c

Any idea?

General Discussion / Temperature Controlled Fan
« Last post by sabareeshchambayil on August 25, 2017, 23:57:12 PM »
 I made this circuit and it worked.


But there no control in pwm.

Turning R2 pot to both extreme end make fan run at full speed and R5  pot has no effect on the fan speed . what I am doing wrong

the NTC value is 4.7 K and Used Bc337-40 in place of BC337 and KSP2222A in place of 2N222A.

Anybody have pcb Layout of this project?
General Discussion / Need help with a servo motor
« Last post by Dizzdogg on July 24, 2017, 03:40:36 AM »
I have a servo motor that I can't figure out how to use (I have enclosed a picture). I've had this motor for 20 plus years and I can't find any info on it, online or anywhere else (I'm new to servo motors by the way). Any and all help will be greatly appreciated.
General Discussion / Temperature based high frequency PWM fan controller?
« Last post by ksuuk on June 23, 2017, 11:08:27 AM »

About  the High Frequency PWM Fan Controller ( http://www.pcbheaven.com/circuitpages/High_Frequency_PWM_Fan_Controller/ )

How to modify this 4 pin circuit, so that it works automatically based temperature?
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