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Got a 350/400w half bridge Ferrite type transformer which needs a rewind, anyone suggest a company that might take it on.
Tried a few but they are too big to bother about such a small job, agreed its a unmarked China made item but was a very "game" supply for abuse until some flash-over took...
Sadly No it had blown up, I know it works on 3 volts and the regulator gets over hot plus must be multiplexed, as there are hundreds if not thousands of these meters around thought that some other person may have explored them before as happens.
Will get and check the power pins at...
I enclose the pictures requested, if they are some simple PIC chip thing then OK I give up and just salvage parts, but if it is a chip that has a number I would be interested. I know that many IC's that have emerged from China are from Texas Industries dating back to the 1960's then were sold to...
Working on an old power supply that has a cut out system that cuts off when turned on with a heavy load connected >6Amps, this seems to be a safety feature and has a timer like action before turning on (charging capacitor).
It is all transistor working 2 O/P 3 pre-drivers, 2 others used for this...
I have one of those small (0.28 inch) voltmeters that are all around, I wonder if anyone has identified its IC used as all the ones I have seen have no markings.
Yes I know buy another as they are cheap, got one that is duff, regulator gets hot. Figure its either a PIC chip or some TI copy...
I have a PC-1000VA ups power supply that seems to have festered its mains plug fuse carrier and caused a problem, it looks like a version of many out there and just Chinese!!.
It has a circuit board marked CE200N 350-1600VA dated 2014.11.04, 4x relays across the board width (1 x 12v 3 x 24v)...
Thank you guys give me some good ideas to work with, I will be trying to cross check power supplies and light strips on my next batch, just seemed at first it was the power supplies as the sick ones had blown their mains bridge diodes so thought that flash might have damaged the chips...
It seems I have some LED light strips to fix, these are run by an obsolete IC TP8533FD with a few capacitors, resistors, coil and rectifier for dc creation and pulse up it diodes.
Most of these units have simply blown capacitors 15uf 400v, 2.2uf 400v and small 50v DC supply (too much pulse...
Building a variable power supply out of bits, the base power from a computer supply I got that had blown up (now fixed) fitted with a more modern control system to enable it economy working under light loading with wide mains input.
On the 4 x 12v outputs it has I was going to fit four...
Thank you all for your help I have read the link regarding smd and other resistor markings etc, I asked RS for their view below is the reply :-
Dear David.
Thank you for your recent enquiry.
For resistors E can be the same as Ω. It is often used in case of high power resistors (power not...
Yes I had read that in my search for an answer thank you, but that was not my question.
I am talking about a circuit diagram code:- 2M - 2K - 2R (OK so far) but 2E?? is what I want to understand about.
Possibly some new code to confuse us or make easier for Chinese to relate to as I know...
Getting confused these days having lived through days of wires looping over each other in a diagram, then just crossing over followed by stopping short of another when crossing over etc, as other countries got confused.
I am now confused with the latest resistor version of circuit diagram...
I have looked at other linear tracking supplies which mostly use opposite voltage regulators with an IC, while mine uses two 7805 types to create +/- 15v but not seen that many circuits with this set up, is that the reason I wonder for it being unstable a design.
If the circuit in diagram 1 is...
I had a manual for the early version of my Booton 102 which is shown in diagram 1.
With the actual Booton I have got it came with a photocopy of a manual with modifications shown in diagram 2
On my Booton I have found that it differs again as in diagram 3, though the parts used are in period so...
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