audio-talk

Well after the Owston disappointment when i could only get one channel to work, i thought the old problem had returned. Got the amp home and took the lid off. One of the capacitors had come loose in transit and the capacitor leg was under some tension so it had sprung loose. rectified this error. ma...

sold to Steve

i have a spare HP t5540 thin client for sale comes with a 30gig hd and cable to swap for the internal flash drive. complete with power supply £35. there is a great thread about these machines under computer audio, well kept secret. they make great music servers. i am currently running one with windo...

i Have a HLLY tamp 90 that is excess to requirements. i used it as a stop gap until i had build up my own tripath amplifier. it works like new but currently does not have any feet. the old rubber ones were removed before i bought it. Looking for £50 this is the latest model without any of the hum is...

gone for a teradac usb to spdif converter. got it for £40 second hand.Its the one with the power supply.
I will bring my computer setup to Owston see how it fares

Im still coming on Saturday.

humming sounds that change in frequency when there is computer activity. there some humming sound as soon as i plug in usb cable, even when the computer power is not switched on. sound is ok through my terakak usb to spdif converter. but i can not use a usb dac as the interference sound is too loud.

Got mine up and running but have a ground loop problem with all the usb ports. does this mean i have to buy a usb isolator or is there a cheaper option?

Had a look at the board again today and followed Brian's advice. I found the tracks leading from the capacitor and scraped some lacquer off to expose the metal. I then soldered this to comnnect it to the cap.
Hey presto it is working

Took the lower capacitor off. the Amp worked as before(left channel only) soldered the cap back on with a big bit of solder. there are three solder poits on each side of the cap, I think for different sizes. I tried joining 2 of these solder poits together to get a better contact. It did not work. s...

Nick wrote:Ok, that shows that all the terminals are floating as they should be. So if you connect a speaker to the right side only, and apply input does anything come out?

Right side only no sound
left side only is good

is it time to try waving the voodoo bones over it
how would i test to see if the input capacitors are working properly?

Set your meter to the 200v DC range (or something similar), hold the black probe on the outside of the phono input plug (either one). Then touch the red probe onto each loudspeaker terminal. See what voltage is on each of the terminals. Do this with nothing plugged into the amp (speakers or interco...

If all this checks out, I would check to see that each channel operates independently. So if you connect both speakers and only give a signal to the left, does it only come out of the left speaker. You can also check the right channel the same way. Brian. Checked that. when i plug either speaker in...

brig001 wrote:If you keep the negative probe of the meter on the negative supply rail, check the voltages on all four speaker terminals. I would expect about 22.5V DC on each.

Brian.

OK done that they all register around 22.5 each