I not sure how it would behave in such a situation but I'm suprised by the damage it suffered. Have you managed to get the boards working now?
Hi Terry,
I have tried to measure the Voltage across the .33R resistors i have installed & it is always 0V. If i put the gnd lead to gnd, i get same reading as the SPK Out. My MA meter also says 0.00ma on the V+ & V- tabs. Getting weirder..
I have tried to measure the Voltage across the .33R resistors i have installed & it is always 0V. If i put the gnd lead to gnd, i get same reading as the SPK Out. My MA meter also says 0.00ma on the V+ & V- tabs. Getting weirder..
If you have 0V across the 0R33 resistors then you have no bias. Difficult to achieve without a trimmer on the VBE multiplier. I temporarily installed a 5k trimmer in place of the 4k7 resistor so I could adjust the bias. Then I measured the trimmer and installed the closest value resistor. In my case it was a 3k9. However, I built mine per the attached schematic. You used different transistors so you will likely end up with a different value.
It is possible that your offset may improve if you can get the bias up where it belongs.
There are not too many transistors. Maybe you could post the voltages you are getting. That would help us help you.
Blessings, Terry
It is possible that your offset may improve if you can get the bias up where it belongs.
There are not too many transistors. Maybe you could post the voltages you are getting. That would help us help you.
Blessings, Terry
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No where i live its a total pain getting semis and they are expensive. I am just going to look around for some outputs. I think the other channels outputs are not dead, but it still has the same problem as one with dead outputs before it lost its outputs if that makes sense🙂 So the other channel exhibits these symptoms:
http://www.diyaudio.com/forums/soli...imate-fidelity-amplifier-103.html#post4377943
measuring in Vdc is not sensitive enough.
You need to set your voltmeter to 2000mVdc, or preferably 200.0mVdc.
Hi Mile, thanks for the advice. I will check this at weekend. To late this evening 🙂
regards Olaf
Just for fun - A2
if you want to test it, I can finalise this board at weekend. I can not build itself, have too many unfinished projects 🙂
regards olaf
Hi Terry,
if you want to test it, I can finalise this board at weekend. I can not build itself, have too many unfinished projects 🙂
regards olaf
Attachments
Terry,See attached for Voltages. ALL ref: to GND. Looks like i blew up another transistor i guess. I will get back to it in a couple days as i have eye surgery scheduled for tomorrow. Thanks to All
Rick
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Your fuses are blown.
EDIT; Looks like the 10R resistor is blown on the + side also. I see you relabeled the pins of the transistors. You can't do that. E is E, C is C and B is B. All you did was spin the transistor.
EDIT; Looks like the 10R resistor is blown on the + side also. I see you relabeled the pins of the transistors. You can't do that. E is E, C is C and B is B. All you did was spin the transistor.
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Hi,i assemble AX14P cuircuit but it is not start good and on the relay ther not goes suplly.so relay become not on,why
Hi,i assemble AX14P cuircuit but it is not start good and on the relay ther not goes suplly.so relay become not on,why and 15 volt supply comes on speaker