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[ashok]

Hi Cristi,
You have a pm !

Does the TDA8920 chip require isolation ( mica) from the heat sink ?

Cheers,
Ashok.

[inept]

Originally Posted by inept

I purchased (4) TDA892x Amp V2 with TDA8924TH, and 10000uf 35v capacitors.
I plan on bridging 3 of them to run my L,R, and center speakers at 4ohms.
The other one I will run in stereo for my 8 ohm surround speakers.

Cristi recommended "2x18 to 2x20V AC , the current should be at least 4A, better 5A. the transformer power rating for each module should be at least 180W."

Can I use 1 of these transformers to power two of the modules,, two transformers to power 4 modules?

Antek - AN-2220 ?

Would it be better to use separate transformers for each module?

OOPS! that link should have been for the AN-4220 400va transformer
Antek - AN-4220

[ashok]

The TDA892X is slightly thinner than the Bridge rectifier on the board. This will enable placing an insulating washer between the chip and the heatsink. What sort of insulator. Silicone or mica sheet ?

Thanks.

[kp93300]

Hi Cristi,
The link for LME amp, soft start and the speaker protection circuit appear impaired.
Can you repair them please as I need info to wire them up
thanks

kp93300

[Cristi]

Originally Posted by ashok

Hi Cristi,
You have a pm !

Does the TDA8920 chip require isolation ( mica) from the heat sink ?

Cheers,
Ashok.

between the ic and heatsink must place insulation. the ic pad is connected to negative rail.

Originally Posted by kp93300

Hi Cristi,
The link for LME amp, soft start and the speaker protection circuit appear impaired.
Can you repair them please as I need info to wire them up
thanks

kp93300

it should work now, please try again

Originally Posted by ashok

The TDA892X is slightly thinner than the Bridge rectifier on the board. This will enable placing an insulating washer between the chip and the heatsink. What sort of insulator. Silicone or mica sheet ?

Thanks.

both of them are ok, as long as they make a tight contact and you add some silicone electrically non-conductive compound.

[fb]

Cristi, what class D/T board would you recommend to connect directly to a high sensitivity (110db/w/m) driver to avoid hiss? TDA892X?

I notice earlier in this thread you mention a 2kw smps, is that happening? What voltages would it supply?
Is there a fan output on the A1000SMPS? Does it need any precautions to reduce EMI?


Thanks

[Cristi]

for lowest noise i recommend TDA892x boards.
i'm currently working at the design of the bigger smps. there will be few output voltage options, starting from +-25V to +-90V.
the A1000SMPS has a auxiliary voltage output adjustable from 5 to 12V with max. 0.5A which can be used for a fan or other amplifier stages. it's ground is isolated from the main output supply, so can be used as bias supply referenced to any rail or gnd.

[fb]

Originally Posted by cnx

for lowest noise i recommend TDA892x boards.

Is it possible to modify the input gain of TDA892x V2 board via pot? I'm not sure if the datasheet applies to this version of the board.

Thanks

[Artcore87]

Hi CNX, what changes have been made to the TA3020v3c version? Would you recommend the smps1000 for this amp? Are any other components required besides these two things? Also would you still recommend the BIPS (180 phase shift) for this amp?

Another question... somebody earlier mentioned changing the mos-fets on the 3020 boards to IRFP4228 for higher output and cooler running... could you do that?

[Cristi]

Originally Posted by fb

Is it possible to modify the input gain of TDA892x V2 board via pot? I'm not sure if the datasheet applies to this version of the board.

Thanks

the gain can be changed only externally, attenuation with potentiometer. the TDA892x IC's has fixed gain which cannot be changed (not very simple)
the manual is similar with the previous version, the boards are based on the same schematic, only the layout is changed.

Originally Posted by Artcore87

Hi CNX, what changes have been made to the TA3020v3c version? Would you recommend the smps1000 for this amp? Are any other components required besides these two things? Also would you still recommend the BIPS (180 phase shift) for this amp?

Another question... somebody earlier mentioned changing the mos-fets on the 3020 boards to IRFP4228 for higher output and cooler running... could you do that?

on the TA3020v3c i added speaker protection circuit, bigger capacitors for the power supply (35mm diameter) and rectifier bridge. the amplifier can be used with smps as well, and the bridge can be removed in this case. BIPS can be used if the supply voltage is close to the upper limit, +-60V to prevent turning ON/OFF when the voltage boost over the maximum limit.
this board can be used in BTL mode directly even without BIPS, by simply connecting one resistor which will bring inverted signal from the output of one channel AO to the input of the other channel AO.
the MOS-FET's can be changed, with IRFB4227 which is one of the best in his class, the efficiency will be improved a little but the output power is still limited to the maximum rail voltage which the IC can admit, so there will be slight changes on the output power.