ESP Project 3A - 60-100W Hi-Fi Amplifier Problem and need helps - Page 2

tiroth · 20th February 2002, 06:11 PM

The transistors sound like they are oriented properly; as for the pot, that sounds good too. You can check that the resistance across it (two of the legs are tied together on the board) is 2k-it must be close to this (or more) or the bias servo will not work. (Adjustments should be made only after getting the amp working on the 'real' supply)

paulb · 20th February 2002, 06:24 PM

I suggest taking a bunch of voltage measurements, best would be to record voltages on all pins of all transistors. We should be able to figure it out from there. It sounds like a short or open circuit somewhere might be the problem.

paulb · 20th February 2002, 07:43 PM

bugbite2k,
Are you actually using Rod's boards? I ask because I remember back in January you were trying to get the layout to do your own. It's important that we know whether you are using Rod's boards (which work) or your own (which may not work).
Why do you think a picture of someone's finished amp will help you troubleshoot?

bugbite2k · 20th February 2002, 08:35 PM

Yes I ordered 2 of them from Rod ..... and I ordered 300 watts sub board too..... That's why I been wasted alot of $ and didn't get it to work ..... I think if some 1 have a picture of the finished board so I could compared to my to see maybe I inserted some transistor wrong ..... but I'm really sure that I did follow Rod instructions

bugbite2k · 21st February 2002, 09:00 PM

hey guys I think I figured out the problem ..... on my R9 and R10, the value i put in it was wrong ..... instead of 2.7K I was mistaken and put in 3 ohm ...... any you you think that could cause my Qs to blow ?? well im going to the electronic shop to find the 2.7 K and sub it in ....... hope this would solve my problem ........ Thnx guys for all your helps

..... it's my stupidity hehehee cheer

tiroth · 22nd February 2002, 01:37 PM

I actually did the same thing once; 2 instead of 2k. It was easier to solve this problem, though, as the results were...rather spectacular.

I now test all of my resistors with a meter before inserting them. It's a nice reality check.

bugbite2k · 22nd February 2002, 08:04 PM

hey guys it's me again hehehe ,,, well I got it fixed up but still only I heard is trebly

any idea what I did wrong because I knew something wasn't right ...... how about the power hook up in the amp ? is it suppose to be where it said -35 and +35 is that where the power suppose to be hooked ?? and what about the Ground under +35 ??? isn't it for input ??? and the - out should also be ground too right ??? help me out hehehe guys, well I'm a newbie in electronic stuffs and this is my second years in hs also my second project in electronic class

thnx guys .... more informations would be very appriciates ...... by the way Paulb had mentions about the dual power supply for it , could you explain or show me how would I hook it up in the amp ... thnx Paul

paulb · 22nd February 2002, 09:09 PM

Rod's diagrams are pretty clear. The power supply has three terminals, +35, -35, and GND. These connect to the same points on the amplifier. The input is applied between IN and GND. The speaker connects from OUT to GND.

HuntTheShunt · 31st December 2004, 01:18 PM

Did bugByte2k get it working?

31st December 2004, 01:18 PM	#19
HuntTheShunt diyAudio Member Join Date: Nov 2004 Location: UK	Did bugByte2k get it working? __________________ DiyAudio

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20th February 2002, 06:11 PM	#11
tiroth diyAudio Member Join Date: Dec 2001 Location: Pittsburgh, PA, USA	The transistors sound like they are oriented properly; as for the pot, that sounds good too. You can check that the resistance across it (two of the legs are tied together on the board) is 2k-it must be close to this (or more) or the bias servo will not work. (Adjustments should be made only after getting the amp working on the 'real' supply)

20th February 2002, 06:24 PM	#12
paulb diyAudio Member Join Date: Jun 2001 Location: Calgary	I suggest taking a bunch of voltage measurements, best would be to record voltages on all pins of all transistors. We should be able to figure it out from there. It sounds like a short or open circuit somewhere might be the problem.

20th February 2002, 07:43 PM	#13
paulb diyAudio Member Join Date: Jun 2001 Location: Calgary	bugbite2k, Are you actually using Rod's boards? I ask because I remember back in January you were trying to get the layout to do your own. It's important that we know whether you are using Rod's boards (which work) or your own (which may not work). Why do you think a picture of someone's finished amp will help you troubleshoot?

20th February 2002, 08:35 PM	#14
bugbite2k diyAudio Member Join Date: Dec 2001	Yes I ordered 2 of them from Rod ..... and I ordered 300 watts sub board too..... That's why I been wasted alot of $ and didn't get it to work ..... I think if some 1 have a picture of the finished board so I could compared to my to see maybe I inserted some transistor wrong ..... but I'm really sure that I did follow Rod instructions

21st February 2002, 09:00 PM	#15
bugbite2k diyAudio Member Join Date: Dec 2001	hey guys I think I figured out the problem ..... on my R9 and R10, the value i put in it was wrong ..... instead of 2.7K I was mistaken and put in 3 ohm ...... any you you think that could cause my Qs to blow ?? well im going to the electronic shop to find the 2.7 K and sub it in ....... hope this would solve my problem ........ Thnx guys for all your helps ..... it's my stupidity hehehee cheer

22nd February 2002, 01:37 PM	#16
tiroth diyAudio Member Join Date: Dec 2001 Location: Pittsburgh, PA, USA	I actually did the same thing once; 2 instead of 2k. It was easier to solve this problem, though, as the results were...rather spectacular. I now test all of my resistors with a meter before inserting them. It's a nice reality check.

22nd February 2002, 08:04 PM	#17
bugbite2k diyAudio Member Join Date: Dec 2001	hey guys it's me again hehehe ,,, well I got it fixed up but still only I heard is trebly any idea what I did wrong because I knew something wasn't right ...... how about the power hook up in the amp ? is it suppose to be where it said -35 and +35 is that where the power suppose to be hooked ?? and what about the Ground under +35 ??? isn't it for input ??? and the - out should also be ground too right ??? help me out hehehe guys, well I'm a newbie in electronic stuffs and this is my second years in hs also my second project in electronic class thnx guys .... more informations would be very appriciates ...... by the way Paulb had mentions about the dual power supply for it , could you explain or show me how would I hook it up in the amp ... thnx Paul

22nd February 2002, 09:09 PM	#18
paulb diyAudio Member Join Date: Jun 2001 Location: Calgary	Rod's diagrams are pretty clear. The power supply has three terminals, +35, -35, and GND. These connect to the same points on the amplifier. The input is applied between IN and GND. The speaker connects from OUT to GND.

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