| michielbeijer |
I just finished (at least that's what I thought I did..) an lm3886 BrianGT kit, but when I powered up I measured some strange values.
First of all, the power supply board makes 28VDC from 22VAC. Not exactly the 1.4 factor I was expecting.
Next, when I measured the DC offset, it was huge: about 1.6V on one channel and 1.7V on the other and the chips get very hot after running for some minutes without any load.
Any advice?
:xeye: |
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| sss |
| something is wring with your connections , dont power it up again u will burn the chip , show some pics if u can |
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| michielbeijer |
| Sorry, already took it apart. I've had it with those really stiff solid core silverized-copper (?) wires. Had to solder the - hard to reach - connections with the pcb's mounted in the case, that was just asking for bad connections.. Now I'll give it a go with some multi stranded wire and report back when I'm finished. |
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| michielbeijer |
| Done! Now with DC offset 0.5 and 0.3 mV (not accounting for deviation of my 15 euro multimeter ;) ). There was probably some shortage going on :headbash: |
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| cozycactus |
sss
hi. where do you find electronic parts in haifa for diy? |
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