gregvp
Q: HOW MANY WATTS REALLY COME OUT AT 8 OHMS?
Asked by BG171754344 on 2021-10-13 03:16:33
Q: What is the voltage rating of these resistors?
Asked by gregvp on 2020-03-01 12:57:05
Angiosperm 50V
2020-03-26 04:27:09 Helpful (0)Q: What size is the DC socket? 5.5 x 2.1?
Asked by gregvp on 2020-03-01 12:25:00
Denouement corrert
2020-03-05 08:43:31 Helpful (1)Q: What kind of RAM? SO-DIMM or DIMM, LPDDR3, DDR3L, or ...?
Asked by gregvp on 2020-02-17 09:16:03
libiying LPDDR3
2020-03-02 10:10:36 Helpful (0)
gregvp Thank you, vallen56. Insufficient gaps and creepage and low-rated components turn these things into death traps. I'll look for something else.
gregvp Thedata sheet says in BTL configuration you must use an 8 ohm speaker. The on-board rectifiers are nowhere near strong enough for 420W; remove them and use 50 Amp, 400V chassis-mounted bridge rectifiers. Smoothing capacitors should be 10,000 microFarad 200V. As stated by others you need a transformer capable of supplying at least 40 Amps, preferably much more. You will need slow-start circuitry to avoid blowing fuses when you switch on the power supply.
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gregvp For listening at home, at normal levels with normal speakers, the module will be fine. It is NOT SUITABLE for prolonged high power because the printed circuit board traces to the speaker connector are not big enough, nor are the heat sink, bridge rectifier or 3300 uF capacitors. I don't know about the transistors themselves. But to answer your question: with a 26 V, 20 A transformer, you will get about 120 W RMS per channel into 8 ohms until something overheats and burns. Probably less than one second.
2021-12-04 11:31:24 Helpful (1)