hi bruno
as written in doctors post
Wire a switch between these two points for manual muting the amp.
with this switch you should do like :
switch on = mute the amp
power up
switch off- amp in normal status
play music
want to turn off?-->
switch on = mute the amp
power off
you can do..switch off- amp in normal status but without power
chris
read at official document of a TI TP3251EVM board...here it is written..
Thanks guys,
I tried connecting those components with a loose wire, and it works, the amp is muted.
Now I'll have to bring out my best soldering skills to solder a permanent switch there. Time to put on my reading glasses
watch out ...soldering pen with just 7,5 -10WATT needed on SMD
Hello Chris,
Thanks for warning me.
I'll put my soldering iron at the lowest temperature to start with.
And what about the soldering tin? I have only 1 mm dia, that is probably too thick.
If one drop falls down on the board, that can be a disaster already, I think.
I'm sorry, I have only experience with soldering on loudspeaker components.
Thanks for warning me.
I'll put my soldering iron at the lowest temperature to start with.
And what about the soldering tin? I have only 1 mm dia, that is probably too thick.
If one drop falls down on the board, that can be a disaster already, I think.
I'm sorry, I have only experience with soldering on loudspeaker components.
yes i know...i haven´t the correct equipment too...
use the smallest soldering tip what you have....try out on an other pcb...or test equimpent to make a small soldering dot.
Not realy if you have big ground planes like on amp boards you will do nothing with 10w.
Im soldering 0603 with 80w iron and a chissel tip with 3 mm or so... also fine pitch 0.5mm components. not a big problem...
yes you are right, bigger soldering taps or bigger components need more power , e.g. 40 w.
especially the solder pads which are GND = big mass to warm up...
Having an adequate power solution for a TPA3255 in a mobile setup was one of my wishes to round up the bikeamp.
I think, i'm done for the first try.
4 phase boost with path-through, made for 600Wrms and 1200W peak, while peak-power is actually only limited by thermal design and input voltage. In theory, this setup should do 4x20A = 80A cont. from a single 12V SLA battery, giving some 960W*0.94 (900W) at the output. Increasing the input voltage will output more power.
PCB size is 100x100mm, as usual.
Using only 2 of possible 4 phases resulted in these values in simulation:
Loop-params:
Vin=20V und Iout=1A: BW 22.4kHz, 69° PM
Vin=20V und Iout=10A: BW 22.4kHz, 59° PM
Vin=20V und Iout=30A: BW 25.1kHz, 36° PM
Vin=27V und Iout=1A: BW 28.2kHz, 68° PM
Vin=27V und Iout=10A: BW 28.2kHz, 61° PM
Vin=27V und Iout=30A: BW 31.6kHz, 43° PM
Vin=31V und Iout=1A: BW 31.6kHz, 66° PM
Vin=31V und Iout=10A: BW 31.6kHz, 60° PM
Vin=31V und Iout=30A: BW 35.5kHz, 44° PM
Having 20+kHz loop bandwidth, i'd call this a fast supply.
I think, i'm done for the first try.
4 phase boost with path-through, made for 600Wrms and 1200W peak, while peak-power is actually only limited by thermal design and input voltage. In theory, this setup should do 4x20A = 80A cont. from a single 12V SLA battery, giving some 960W*0.94 (900W) at the output. Increasing the input voltage will output more power.
PCB size is 100x100mm, as usual.
Using only 2 of possible 4 phases resulted in these values in simulation:
Loop-params:
Vin=20V und Iout=1A: BW 22.4kHz, 69° PM
Vin=20V und Iout=10A: BW 22.4kHz, 59° PM
Vin=20V und Iout=30A: BW 25.1kHz, 36° PM
Vin=27V und Iout=1A: BW 28.2kHz, 68° PM
Vin=27V und Iout=10A: BW 28.2kHz, 61° PM
Vin=27V und Iout=30A: BW 31.6kHz, 43° PM
Vin=31V und Iout=1A: BW 31.6kHz, 66° PM
Vin=31V und Iout=10A: BW 31.6kHz, 60° PM
Vin=31V und Iout=30A: BW 35.5kHz, 44° PM
Having 20+kHz loop bandwidth, i'd call this a fast supply.
Attachments
Well, the "el cheapo" TL494 based boost-converters are limited to 20/30A at best, so using them with only 12V input voltage wont give the "extra punch" +3dB in bass we can get from a 4 phase converter with much higher bandwidth.
SURE/Wondom is offerinh a TL494 based solution in similar size but with a big heatsink - rated at 500W output power running at 55kHz.
The Teufel Rockster "Boombox" btw. is also using a 4 phase converter, limited to 400W.
SURE/Wondom is offerinh a TL494 based solution in similar size but with a big heatsink - rated at 500W output power running at 55kHz.
The Teufel Rockster "Boombox" btw. is also using a 4 phase converter, limited to 400W.
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I was looking at the different, more "finished" solutions. The design on the following seems reasonable, possibly without the many issues the more reference styled designs have:
Yuan Jing Audio - TPA3255 Class-D 2.1 Stereo Amplifier [150W x 2] + Sub-Woofer [325W] + Audio Tuning + Bluetooth - USD $95.50 - Multi-Channels Features
This is an updated version of the YJHIFI design with an older bluetooth chip. Any thoughts? But what I'm really wondering is ... why are there so many 2.1 TPA3255 amps from China with no LF-crossover frequency adjustment? The size of a
passive subwoofer choke would be massive, so surely these aren't designed with a choke in mind?
Yuan Jing Audio - TPA3255 Class-D 2.1 Stereo Amplifier [150W x 2] + Sub-Woofer [325W] + Audio Tuning + Bluetooth - USD $95.50 - Multi-Channels Features
This is an updated version of the YJHIFI design with an older bluetooth chip. Any thoughts? But what I'm really wondering is ... why are there so many 2.1 TPA3255 amps from China with no LF-crossover frequency adjustment? The size of a
passive subwoofer choke would be massive, so surely these aren't designed with a choke in mind?
I have many amplifiers, 30 or more, and the TPA3255 is in another league from the 3116. Most of the amplifiers I have built are class A SS and tubes. Firstwatt clones and tube amplifiers such as SE300B, SE45 and a couple of SE-El34. The 3255 is an amp I could live with and not miss anything. I do prefer some of my other amplifiers over it but only by a small measure.[/QUOTE]Wdecho, could you compare the 3255 with a Jean Hiraga Class A? How would you rate the op of 3255?