Thanks. The owner is going to find another relay, same part number this time, and see what happens
Will keep you all posted. Thanks...
edugimeno
Badcaps Veteran
Last Activity: 08-02-2025, 04:19 AM
Joined: 05-30-2017
Location: Spain
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Ok, we got a reply from the electrician, this is the relay he removed, it looks like he swapped the socket as well...
Eltako ER12-001-UC
So GPT states that this is NOT a SOlid State relay but it is electronically triggered (darlington inside?) so it takes really low power and also it says it works by pulses (toggle??) so it won't take current while ON...does it make sense?...Leave a comment:
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I think what you are seeing is the remain of flux from when I desoldered the header that drives the relay for the pellet feeder, right on top of the LF444, but I didn't touch that IC at all, and I am the only one who has touched this board. No, I don't think this IC has anything to do with this function, which seems to solely relay on the LM358, the LF444 is used for INPUTS, as it is wired to other headers for detectors.
Im still awaiting for the owner to get a picture of the original relay that the electricina removedLeave a comment:
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That IC is an LF444 (Quad OpAmp), I already checked it before, it has some inputs connected to some other headers (I guess sensors) at the board, it seems like one track is connected to the same header (see scratched varnish) but I removed the header and this track goes across to another header on top if it. I checked and there's no electrical connection at all between this LF444 and the pellet feeder output header
Thanks...Leave a comment:
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No worries, maybe you misunderstood me. I was just asking what would be the "usual" device to have out of the board to be controlled directly by the output of an OpAmp in order to drive a 220v AC motor. Assuming the electrician didn't change the socket, I guess there would be a SS relay, but anyway my friend is going to find out soon when the technician sends a picture of the "relay" he took., I am 100% positive the board itself has not been altered my any means, but any component out of the board might...
Thanks!Leave a comment:
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No, I have the board, but the board is part of a large machine installed at the basement of this building. I only took the board. The relay socket (din rail mounted) along with other boards and modules were left in the machine, from which I took no photos... The owner is asking the electrician for the original relay PN or a photo...Leave a comment:
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I talked to the owner, he said the electrician left saying the relay wasn't working and he was going to find another relay, he took the original. Then he came back with a bunch of other relays and none worked. I bet there was a solid state relay and he tried to replace it with a mechanical relay? Does it make sense? Do you thing there are SS relays that match pinouts with classic mechanical relays to use their sme socket? Maybe he swapped the socket too. He's calling this electrician to ask for a photo of what he tookLeave a comment:
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You mean the resistor between the OpAmp output and the header right? I can't get a valid measurement now as I got this board at my house (15 km from the original machine) and I can't force the output to HI, but if we find out the relay should not be a normal mechanical relay, I will be back there soon...Leave a comment:
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Thanks, the fact is that when I got there, there had been another guy, an electrical guy, who left some relays around there, of varied voltages like 6V and 9V, and left the place saying the issue must be at the board as none of the relays work... This makes me think, maybe he modified something in the circuit and what was in the relay socket was not a normal mechanical relay?
What could it be? An electronic relay? There was a rail mounted relay socket, that's all I found there...Leave a comment:
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Repairing a ENERTRES Biomass BI-650 heater
Hi all!
A friend asked me to repair his biomass (pellet) heater. This heater has a pellet feeder powered by a relay that's not switching anymore
I measured the voltage at the relay coil socket while entering the individual tests procedures and it has 6-7v while the relay is NOT on the socket, and drops to 0v when the relay is plugged in the socket, like the source is providing nearly 0 mA. I measured the relay coil and it is correct and not shorted so the issue is in the board, fed no amps to this output
I checked the board at home and this output is driven by an... -
Hi, thanks! Some answers.
The clip led is off all the time. Yes its a dual amplifier, it looks like the 4 large transistors at one side (bottom side of board) feed tha large sobwoofer, and the other 2 transistors at the other side (still bottom side of board) feed the medium size speaker
I didn't spend any time at all for now with the other boards at there only one signal wire linking them to the main power board, so this is the only way the sound has to enter the power board, and applying a signal on this wire should get some sound if the power board was fine. Maybe if I fix the power...Leave a comment:
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Stagg sms12p audio amp has water damage
Hi! My friend just brought this audio amplifier/speaker fro his music band saying they realized its got no sound. Led powers up but there no sound at all
I opened it and found 3 board. 2 of them are for input plugs and potentiometers, and the other larger board has the amplifiers for 2 large speakers that it drives
There's also a large toroid transformer that feeds a lower voltage to the first 2 boards and a larger voltaje (36x2 rectified close to 100v) to the power board. The power board has the plugs for both speakers
There is only one signal wire connecting the first boards... -
Thanks, I want to believe that the lower transformer is actually used backwards on purpose, like the top transformer provides a variable voltage that is regulated on the right side of the circuit, and a proportional voltage is applied to the right side of the lower transformer, which in turn drives and modulates the top transformer to alter the 0-12v voltage to the peltier cell & fans?
Not sure thou...Leave a comment:
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Hi again!
Im still investing some time, not much as Im busy lately... on this project
My first issue, is that I dont' reallly understand how this whole circuit works,.
I've found the schematic, attached as 2 images.
So there are 2 main transformers, small and large. Small has 1 dual winding and another single winding on the primary side. Center tap on dual primary winding seems to be controlled by twin mosfets, 1 drives to Vcc, 1 drives to GND. But then the top winding comes in series with the other transformer, and this is what I don't understand why they get interconnected....Leave a comment:
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You mean the diode, that looks like it has a thin line across? I think it's just a camera reflection, but I tested it with my MM and it checks good in diode mode 0,5v- infinite on both ways
Thanks
Its got to be something closer to the chopper,,, I believe...Leave a comment:
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ANyone? Thanks!!Leave a comment:
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Ok Im completly lost at this time... Here's how it went:
I found a proper 60W incandescent bulb and a socket
I bought all the suspicious capacitors, including the HV pair to make sure they are the same capacitance
I went to where I have this board and put all the news caps in, replaced the mosfet, added the bulb in series and powered up
Nothing happened not even noise.. Mains current wasn't going too far. The fuse was blown too!
Ok replaced with a similar vale and tried again. 0,3v at 12V outputs...Traced from start to end. 160V DC on each HV capacitor, this is good....Leave a comment:
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Yes this one feeds a peltier cell thats supposed to be 80-100W I believe...But I will be testing it without the peltier cell as I brought home the board only. I just came back from the shop to buy all caps, will test them later tonight, still need to find the bulb, nothing at the shop, will see at my dad's houseLeave a comment:
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Alright, will be back with some news hjopefully in a couple days, tnxLeave a comment:
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Ok I'll get the caps from my local shop tomorrow monday and try it. What's the wattage used for the dim bulb series tester? It's going to be hard, filament bulbs have been forbidden to be sold here in Spain for many years now, I haven't seen a non LED bulb for a looong time
60W is fine?Leave a comment:
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