Hi Everyone I just joined the forum (Ive been reading it for weeks so thought it was about time) I had a moment of madness on Ebay (as you do) and bought a 2.1 Class D amplifier. Please see my question and specs below
Specification:
Here is my question,
I need a small (light weight) power source for it, I had in mind a SMPS but im not sure;
A. Is it possible? it wants AC28-0-AV28 input but SMPS are DC?
B. Ive read a lot about recommended power and believe I need 600w for this amp
C. Please dont make me put a Toroidal in it, im trying to keep the weight/ size down
Chip
Specification:
- Work: Class D
- Quiescent Current: 65mA
- Work efficiency: 90%
- Left and right output power: 2 * 150W
- Subwoofer output power: 250W 8ohm
- Frequency response: 20Hz to 20KHz
- Operating voltage: Dual AC15V to AC28V
- Recommended supply voltage: AC28V-0-AC28V
- PCB size: 150 * 145MM
Here is my question,
I need a small (light weight) power source for it, I had in mind a SMPS but im not sure;
A. Is it possible? it wants AC28-0-AV28 input but SMPS are DC?
B. Ive read a lot about recommended power and believe I need 600w for this amp
C. Please dont make me put a Toroidal in it, im trying to keep the weight/ size down
Chip
Is that the black caps in this picture?
Why would you go for a 40-0-40DC? (just curious)
An externally hosted image should be here but it was not working when we last tested it.
Why would you go for a 40-0-40DC? (just curious)
See Crest factor - Wikipedia, the free encyclopediaWhy would you go for a 40-0-40DC? (just curious)
28 VAC * √2 ≒ 39.6 VDC
BUT: According to the datasheet of the TDA8950, ±40 V is the maximum supply voltage this chip can handle. So I'd rather go with 36/37 VDC (as suggested in the datasheet) to leave a little headroom, just in case. You'd lose some 10 % of the maximum output power though, but you are on the safe side. Edit: The 2x150 W given in your description are at 4 Ω with 10 % THD and VP ±37 V.
Disclaimer: I'm not an expert, so corrections to my assumptions are very welcome.
Last edited:
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