Has anybody got the circuit for this meter ?
Thanks
Barry
Thanks
Barry
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Re: Aneng dt 9205a dvm
what chip does it use?
dtm0660?
dm1106? -
Re: Aneng dt 9205a dvm
Hi cant tell what the chip is attached a picture .
I know this was quite cheap ,bought it from Amazon because I had blown workshop one on some Ferrus power supplies, in fact its not bad just a bit low on all readings,when I compare it with my best meter which is accurate.
Just would like to increase the counts which will make it bit better.
If you see my other post ,I found a resistor O/C on the Maxcom ,so got lots of meters now 8 or 9 .
3 scopes.
BarryComment
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Re: Aneng dt 9205a dvm
dont know what happened with the pictureAttached FilesComment
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Re: Aneng dt 9205a dvm
i dont think you can increase the count if it doesnt use one of the chips i listed,
are either of the 8pin chips a 24c02 eeprom?Comment
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Re: Aneng dt 9205a dvm
Hi I did find some info on line ,which I did not think was correct . It showed a circuit with 7106 IC.
I wiil take a look next week.
BarryComment
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Re: Aneng dt 9205a dvm
it's not the old icl chip - the tracks dont fit the schematic.Comment
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Re: Aneng dt 9205a dvm
It might be the new chip which has 44 pins
R34 is connected to pin 39 (100K) reducing by padding this with 10M has brought up the reading .Its slightly high now .
One of those tiny pots would be nice ,but have never found them anywhere.
I have got some SM 10M resistors left over from a scope repair ,so I will fit one of them.
BarryComment
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Re: Aneng dt 9205a dvm
i have those pots - they come from ali express.
https://www.aliexpress.com/item/32843902104.html
if your in a pinch, you can find them on cd/dvd laser assembly'sComment
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Hello. Which tool is better for in-circuit testing of e-caps? I was thinking about getting proper LCR meter like DER DE5000 but as i have seen more accurate are ESR meters like ESR70 from Peak if we are measuring in-circuit. Is that true?
Sometimes ESR can not be accurate when in-circuit but still want to get the best tool for it. -
I read EBOOK of Testing Electronic Component and found that
"In order to test the small blue resin coated ceramic disk capacitor which has 104 50v specification,it is possible to test this small ceramic capacitor by making use of analogue meter.
Set to times 10Kohm that has 12v output from the probe to check disorder of ceramic capacitor.
It is not uncommon that testing result of digital capacitance meter is okay,But It show shorted reading when you check it with analogue meter."
Is it really possible to test small ceramic disc capacitor with analogue... -
Hi,
I am repairing a ups which doesn't turn on ,it has the following ICs:
SG3525 used to drive inverter mosfets.
couple of uc3483, one for the power supply and another to drive a big mosfet at the output stage(i think the technique is called boost)
A LM358 and TL074 for control mechanism and of course the uController.
The SG3525 is shutting down every time the ups is turned on.
I want your help to know the function of LM358 and TL074 in the system.
I reverse engineered the LM358 circuit and i think that one of the block(A) is used for battery level... -
Hi friends of electronics
What you see in the video and pictures attached is the circuit for charging the batteries of a DC motor.
The problem is that this circuit cannot charge the batteries (3 1800mAH NiMH batteries) any more. When the circuit was OK, its green LEDs lit up one at a time to show that the batteries have charged more. But now that the circuit is flawed, LEDs light up as you see in the video and at the same time successive beeps are heard.
Please help me fix this circuit.
(the datasheet of the IC: https://pdf.datasheet.live/28... -
I have a faulty right VU meter.
At the poles, the DC voltage varies between 0.5 - 1.5 V
The indicator does not respond to the ohmmeter at all.
I checked
transistors Q202, Q203
capacitors
C230, C231, C412
D202 diode.
Variable resistor VR 204
T 201 coil
Anyone have an idea how to get rid of the DC voltage?...
Comment