No sound from reboxed t-amp

brentkrew · 17th April 2009, 12:18 PM

Hello all,

I have reboxed my original t-amp according to the instructions on the tnt website. No new caps or anything like that, just new terminals.

I could not get a 50k pot so using 100k from maplin. Also still using 3.5mm input on board for phono input.

However, I am not getting any sound from either channel. Just some rapid clicking noises...

I initially had some problems powering up - it seems the metal case was to blame... I have taken everything out of the chassis I made to test and it powers up fine.

Is there some tests I can do to track down the problem?

Regards,

Paul Ross, Devon UK

DcibeL · 17th April 2009, 06:18 PM

Quote:

Originally posted by brentkrew
I initially had some problems powering up - it seems the metal case was to blame... I have taken everything out of the chassis I made to test and it powers up fine.

What's connected to the chassis? Photos of your wiring / connection in the chassis would help a lot.

DigitalJunkie · 17th April 2009, 08:50 PM

Are the new terminals insulated from the chassis? Perhaps the speaker outputs are shorted to the case?

brentkrew · 17th April 2009, 11:14 PM

Hi all,

(Been pointed here after posting in the chip amps section - sorry)

I have been reboxing my original t-amp. Like on the TNT website, just new terminals - no new caps etc.

I am not getting any output from the amp on either channel. I initially had some problems powering up. I was getting clicking noises from the amp. It seems the metal case was causing the problem because I have now taken everything out of the case and it powers up fine.

Here is some photos to give a rough idea of how it looked before i removed everything. I tried the 3.5mm input and the phono using croc clips. Pot is 100k from maplin.

Pics here

Here

and here

Cal Weldon · 17th April 2009, 11:18 PM

Hi,

I merged the two threads and got rid of the duplicate photos and the redirect post from pacificblue so if it seems like something is out of place, that's why.

nic6paul · 17th April 2009, 11:21 PM

Perhaps take it out of the chassis and try to see if it still works. If it does you probably should look into how you are installing it in the chassis.

brentkrew · 17th April 2009, 11:26 PM

Have been testing everything free of the case and it powers up ok but no sound.

Think i'll mount everything on a plastic back panel if i get it working.

Worried somthing got fried when powering up in the case.

slam · 18th April 2009, 04:17 AM

I got those click sound from T-amp before when I accidentally grouded of the "ground" of the speaker output by hooking it up the to a scoop. The speaker -ve output of T-map is not grounded. Maybe you grounded the -ve output to the case?

brentkrew · 19th April 2009, 04:29 PM

I could not get any joy from this amp. I think maybe it got wrecked by speaker terminals touching metal case?

I dug out my spare t-amp board --- i had trouble bridging the caps with my old soldering iron. Did the bass improvement mod as per audio1st diagram... powered up first time and sounds excellent.

thanks for your suggestions anyway guys. now to refine the case i made with plastic back panel...

masood · 13th October 2011, 11:03 AM

hi all,
i have just assembeled 50w maplin amplifier i am cofused to wiring of psu and speaker can anybody help me.thanking you all.

17th April 2009, 12:18 PM	#1
brentkrew diyAudio Member Join Date: Jun 2006	No sound from reboxed t-amp Hello all, I have reboxed my original t-amp according to the instructions on the tnt website. No new caps or anything like that, just new terminals. I could not get a 50k pot so using 100k from maplin. Also still using 3.5mm input on board for phono input. However, I am not getting any sound from either channel. Just some rapid clicking noises... I initially had some problems powering up - it seems the metal case was to blame... I have taken everything out of the chassis I made to test and it powers up fine. Is there some tests I can do to track down the problem? Regards, Paul Ross, Devon UK

17th April 2009, 11:14 PM	#4
brentkrew diyAudio Member Join Date: Jun 2006	No output from reboxed t-amp Hi all, (Been pointed here after posting in the chip amps section - sorry) I have been reboxing my original t-amp. Like on the TNT website, just new terminals - no new caps etc. I am not getting any output from the amp on either channel. I initially had some problems powering up. I was getting clicking noises from the amp. It seems the metal case was causing the problem because I have now taken everything out of the case and it powers up fine. Here is some photos to give a rough idea of how it looked before i removed everything. I tried the 3.5mm input and the phono using croc clips. Pot is 100k from maplin. Pics here Here and here

17th April 2009, 11:18 PM	#5
Cal Weldon Speakerholic diyAudio Moderator Join Date: Jan 2004 Location: British Columbia	Hi, I merged the two threads and got rid of the duplicate photos and the redirect post from pacificblue so if it seems like something is out of place, that's why. __________________ Next stop: Margaritaville Some of Cal's stuff \| Cal Weldon Consulting

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17th April 2009, 08:50 PM	#3
DigitalJunkie diyAudio Member Join Date: Apr 2003 Location: Portland,Oregon Blog Entries: 4	Are the new terminals insulated from the chassis? Perhaps the speaker outputs are shorted to the case?

17th April 2009, 11:21 PM	#6
nic6paul diyAudio Member Join Date: Jan 2007 Location: Minnesota	Perhaps take it out of the chassis and try to see if it still works. If it does you probably should look into how you are installing it in the chassis.

17th April 2009, 11:26 PM	#7
brentkrew diyAudio Member Join Date: Jun 2006	Have been testing everything free of the case and it powers up ok but no sound. Think i'll mount everything on a plastic back panel if i get it working. Worried somthing got fried when powering up in the case.

18th April 2009, 04:17 AM	#8
slam diyAudio Member Join Date: Jan 2005 Location: CA	I got those click sound from T-amp before when I accidentally grouded of the "ground" of the speaker output by hooking it up the to a scoop. The speaker -ve output of T-map is not grounded. Maybe you grounded the -ve output to the case?

19th April 2009, 04:29 PM	#9
brentkrew diyAudio Member Join Date: Jun 2006	I could not get any joy from this amp. I think maybe it got wrecked by speaker terminals touching metal case? I dug out my spare t-amp board --- i had trouble bridging the caps with my old soldering iron. Did the bass improvement mod as per audio1st diagram... powered up first time and sounds excellent. thanks for your suggestions anyway guys. now to refine the case i made with plastic back panel...

13th October 2011, 11:03 AM	#10
masood diyAudio Member Join Date: Dec 2010 Location: fatehpur	hi all, i have just assembeled 50w maplin amplifier i am cofused to wiring of psu and speaker can anybody help me.thanking you all.

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