i have not had time to experiment yet - i really need to make some probes too.
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https://www.ebay.com/itm/405035016711
I got this device yesterday and did some testing on some tabbing and some incandescent light bulbs and it seems to work very well from what I can tell but how do I know how accurate the m-ohms section is what can I use to verify it accurately I also tested some li-ion battery cells and this seems to be fairly accurate because I have another tester and they seem to agree with each other
I also checked some capacitors with it that were brand new and seem to show about what I expected to see with my blue capacitor tester so I think it... -
Hi folks!
I have some kind of memory problem on Lenovo laptop. I was initially able to install windows after several tries since the laptop did freeze in middle of those attempts.
Eventually I discovered that it was related to moving the laptop.
Later on it even stopped booting unless I pressed around the memory slot. (no keyboard LEDs only power button responds)
If I remove the RAM I get the beeps that RAM is missing. Inserting the RAM there is silence and it will not boot most of the time. No picture.
I removed the board got one of those memory slot testers... -
Hi friends
I have reverse engineered this tester, schematic is attached and is complete except for capacitor values. These testers annoyingly have no model number but they are the ones you find on the first page of just about any website if you type in "18650 4-channel tester". There is also a 2-channel variant and a newer 8-channel variant. They are very cheap (about £15) and can measure voltage, current, internal resistance and capacity. They have a multicolour display for all these statistics. They also have terminal blocks so that if you want to use a breakout board... -
When I first turned this battery testing machine the fan for the switching power supply was a little bit noisy but once I recapped the switching power supply board it quiet down considerably then I put a temperature controlled fan that does the mosfets control board was really noisy but now that it is cooled with temperature controlled fan that sensor was moved from the fan to the heat sink so now that the fan is controlled this way the fan runs according to the temperature of the heat sink
This switching power supply was really fun to recap the quality of the board was very good... -
Hi all,
I'd like to add a ring tester to my toolbox to test flybacks but also low frequency transformers if possible.
I found a few products online, some based on the "diodegonewild" design, others are different designs. Some are available to build DIY, others are not.
Any suggestions on a DIY one I could put together? Ideally something which would also be able to test low frequency transformers, that might be handy.
So far I found these two:
http://bobparker.net.au/Basic%20Digital%20Ringer/ (the posher version...
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