Sure ) I am still wondering about that motorized volume pot.... Anyway I will test it and then come back to you ) I am curious to see )
Is it possible to use this kind of stereo amp module as a mono bass amplifier? How?
Is it sufficient to provide ±41VDC power suply for it (I already have that supply in my old amp)?
Is it sufficient to provide ±41VDC power suply for it (I already have that supply in my old amp)?
You can use a dual rail PSU only if you make sure the value of the power caps are bigger than the rated voltage from the main output.
I did it with my Jlester tpa3255 amp )
Amigos !
I made a test this week end with a TPA325X amp + Dual Tripath amp : OPA2210 super Beta (Bipolar) OP amps vs OPA1656 and OPA1692.
I left the OPA1656 for the left channel Slot DIP1 and put the OPA2210 for the right channel slot DIP2, so as not to distort the listening
For those unfamiliar with the OPA 2210, I highly recommend giving it a try! they are bluffing !
https://www.ti.com/product/OPA2210
They bring a lot of micro details to the listening, while remaining very transparent. They have the soundstage of the 1656, with all the musicality of the OPA1692. So I ordered 8 OPA2210 that I will go up in DIP8 adapters.
I made a test this week end with a TPA325X amp + Dual Tripath amp : OPA2210 super Beta (Bipolar) OP amps vs OPA1656 and OPA1692.
I left the OPA1656 for the left channel Slot DIP1 and put the OPA2210 for the right channel slot DIP2, so as not to distort the listening
For those unfamiliar with the OPA 2210, I highly recommend giving it a try! they are bluffing !
https://www.ti.com/product/OPA2210
They bring a lot of micro details to the listening, while remaining very transparent. They have the soundstage of the 1656, with all the musicality of the OPA1692. So I ordered 8 OPA2210 that I will go up in DIP8 adapters.
yes I checked again for continouity with a multimeter
connected to macbook 13" 2007 the amp is directly in fault > headphone 3.5mm stereo jack to 2x rca connector
connected to a phone with the same cable its fine
I have no Idea
is there anything i am missing do i need separate ground to the amp too, but wher to connect it?
when you plug your cable into the macbook check the RCA pins for any DC on the pins. Does the macbook headphone jack multi use? ie volume control, mic input etc
Attachments
something just does not make sense
case is grounded from IEC inlet I checked for conintouty
so also the poti shaft I had added an extra ring cable lug, now with the ground to poti shaft attached its FAULT on startup
without it startups fine can test tomorrow further with speakers and source connected
I guess it was a groundloop issue
also the sound interface < TRS Connecter of my sons macbookpro12,1 A1502 3.1 GHz Core i7 (I7-5557U) < it seem to have fried the onboard sound chip it doesnt recognized anymore
regardless if I clean boot from an external drive or internal.....
I measured everything before connecting there is NO DC voltage on RCA sockets.. no audible hiss when turning the potio to 90-100% on speakers... and I used an "old" mp3 player as source for saftey sounds crystal clear connected my laptop perfect sound..
thanks for you help guys I dont know what was wrong but mayor issue was a groundloop i somehow created
how difficult would it be to modify a PA5 to build in a Line Level High Pass filter at around 70-80 Hz ?
Hello,
I have built an amp around the 3e TPA3255 board. A pretty straightforward build since this is my first DIY amp. To power it I am using a SMPS300RS.
I have been scratching my head a couple of hours already on an issue and I hope you guys can help me.
I feed the amplifier input with an unbalanced signal though RCA connectors. The signals from the RCA connectors are connected respectively to IN1+ and IN2+ pins on the amplifier board and the signal grounds from the RCA connectors are connected to the AGND pins on the board.
The j3 and j4 jumpers are set to 'single ended' (far left position).
To test it I connect an mp3 player via a minijack to RCA cable. I am using small bookshelf speakers as output. When powered up, the small 3V3 led on the amplifier board lights up. No fault led lightning up.
There is absolutely no sound coming out of the speakers, no music, not even noise from fiddling with the RCA input or humming.
The mp3 player, the speakers, the RCS cable have been tested independently and are working correctly.
What did I miss in the build?
(do not mind the front panel connectors, vu meters and potentiometer in the below images they are not connected)
I have built an amp around the 3e TPA3255 board. A pretty straightforward build since this is my first DIY amp. To power it I am using a SMPS300RS.
I have been scratching my head a couple of hours already on an issue and I hope you guys can help me.
I feed the amplifier input with an unbalanced signal though RCA connectors. The signals from the RCA connectors are connected respectively to IN1+ and IN2+ pins on the amplifier board and the signal grounds from the RCA connectors are connected to the AGND pins on the board.
The j3 and j4 jumpers are set to 'single ended' (far left position).
To test it I connect an mp3 player via a minijack to RCA cable. I am using small bookshelf speakers as output. When powered up, the small 3V3 led on the amplifier board lights up. No fault led lightning up.
There is absolutely no sound coming out of the speakers, no music, not even noise from fiddling with the RCA input or humming.
The mp3 player, the speakers, the RCS cable have been tested independently and are working correctly.
What did I miss in the build?
(do not mind the front panel connectors, vu meters and potentiometer in the below images they are not connected)
