that's looks better, however, SMPS is too weak for a peak current ability. As I like to say - it is not HiFi 😉
Thought and left one amp TPA3255. Configured in 2.1, PSU 45V
Added 3 cap 4700x50, ripple current 3355 mA = 10A
+ 6x680uf SXE nippon chemi-con, 1100 mA per cap = 6,6A
Enough for 200W+2x50W max.
Added 3 cap 4700x50, ripple current 3355 mA = 10A
+ 6x680uf SXE nippon chemi-con, 1100 mA per cap = 6,6A
Enough for 200W+2x50W max.
it's too optimistic, in fact, your rail will drop from 48V to 23V and less during 1/10S even if the load is 2ch 4ohm. For instance, Pro audio standard power rollback is 2S, that's enough in the most case of music content but this is a far away not HiFi, it is compromising approach for musicians and stage. Your setup is 20 times worse( 2S/.1S = 20), the power drops 6 times first 200mS, does exist any reason to not use a decent SMPS?
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My loads 2x8 ohm +1x4 ohm, 2xSE output + 1 BTL output, see datasheet
Total output power is less 300W
I have Hypex SMPS400A100, output voltage is low, only 36V, little for TPA3255.
Total output power is less 300W
I have Hypex SMPS400A100, output voltage is low, only 36V, little for TPA3255.
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I'm not familiar Hypex products, sorry. You simply need more amperage SMPS for you amps that's it. Such simple things are very easy to calculate/simulate, don't underestimate this approach.
Yeah, as usual, but you have a second option - a lot of alcaps for averaging the current ripples. For example, in my HiFi TOY design I've no room for a big caps tank, hence, I going with over-beefy SMPS mosfets (22A when <=10A looks more reasonable by a first glance).
PS: actually, Hypex SMPS is an audio product so its 35V would be MUCH more than your 48V with industrial SMPS.
PS: actually, Hypex SMPS is an audio product so its 35V would be MUCH more than your 48V with industrial SMPS.
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New life for 70's Kustom X-strereo Power Amp
A friend had this amp in his shed for many years , only one channel was working ,and a few weeks ago that also gone up in smoke . No more music in the shed during our Friday afternoon happy hour
I had a look at it and both power amp boards were totally fried .
I replaced them with 2 L15D pro's and put in a new PSU board with 20.000 MicroF per rail .
Only original PCB is the input buffer / volume control and overload indicator .
Sounds great again ! 40 US$ for 2 amps
Cheers ,
Rens
A friend had this amp in his shed for many years , only one channel was working ,and a few weeks ago that also gone up in smoke . No more music in the shed during our Friday afternoon happy hour
I had a look at it and both power amp boards were totally fried .
I replaced them with 2 L15D pro's and put in a new PSU board with 20.000 MicroF per rail .
Only original PCB is the input buffer / volume control and overload indicator .
Sounds great again ! 40 US$ for 2 amps
Cheers ,
Rens
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ice, you may want to check if these old plastic resistors and elytic caps on the original board still measure good fler this long period of time.
Thanks Jon ,
I used this one : Assembeld Power supply board 4pcs NOVER 10000uf/50V Capacitors for amplifier | eBay
I can recommend this seller , very reliable and fast shipping , took only 11 days between ordering and receiving in Australia
Cheap , but well build ,Only 50V ( not the best )capacitors , but amps work on +/- 43V so no problems here .Remember this is a shed amp with 2 large 2x12"+ piezo's 4 ohm PA speakers 🙂
No clicks , Pops , Hum or noise and voltage is stable thanks to the large capacitors even at 2 x 100w 20Hz . clips around 140 watts in 4ohm
Cheers ,
Rens
Thanks doctor 🙂
I didn't check the resistors and capacitors on the board , but did check the frequence response, noise and distortion after I replaced the opamps with NE5532 . all was fine .
Cheers ,
Rens
Strange, I thought more people would be upset about that.
I have to at least get credit for building the worlds heaviest tda7498 😬
I have to at least get credit for building the worlds heaviest tda7498 😬
