The problem</SPAN> comes from the fact that the signal and GND tracks are thin, long and they go around. When I gave the entrance directly to the 2,2 uF capacitor my problem disappeared
Thanks and regards</SPAN>
Thanks and regards</SPAN>
hi mile can I use +/- 45v supply for this amp?
under test with 25Vac
under test with 25Vac
An externally hosted image should be here but it was not working when we last tested it.
This is not recommended. Absolute maximum for these chips is + /-39V for 8ohm load. For more info look datasheethttp://www.st.com/stonline/books/pdf/docs/1057.pdf
What is a wattage rating for resistors used for schematic in post #1?
What is rating for two small (looks ceramic) caps labeled 391 on schematic?
What rating can I use if I can't find exact same rating caps (for theese 391)?
What is rating for two small (looks ceramic) caps labeled 391 on schematic?
What rating can I use if I can't find exact same rating caps (for theese 391)?
For schematic at post #1 list of elements:
Code:
C El 22u 10 x
C El 2u2 2 x
C El 2200u 4 x
C Cer 330p 2 x
R 100k 2 x
R 22k 7 x (or 6 x if not using bridge aplication)
R 10k 4 x
R 4k7 2 x
R 470R 2 x
D 1N4148 2 x
IC TDA7294 2 x
Fuse 5A 2 x
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Apex, big thanks for sharing this circuit! Just finished building mine. Soooo good sound. Sounds just perfect driving my USSR time making home speakers Amfiton 35AC-O18 70W 4Ω, can be seen in pics, they're old, but they are good too.
Just got one question, shoudn't be speaker + and - terminals in post #1 diagram in oposit direction? Because according to diagram & schematic + terminals comes from PCB common ground... or am I wrong?
Just got one question, shoudn't be speaker + and - terminals in post #1 diagram in oposit direction? Because according to diagram & schematic + terminals comes from PCB common ground... or am I wrong?
Attachments
Yes, 470ohm. And ceramic cap in Apex original schematic is 390pF not 330pF, wrote 330pF because couldn't find 390pF and used 330pF as Apex suggested. Works well.
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apex are u shure that big jumpers are also used in stereo version , because thats not what u sad , but thats whats in the pitcuree?????
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Sir, I had build TDA7294 bridge amp(subwoofer), working is good! volume is great!
but,I have problem, very poor bass effect!,punching bass effect is very poor!
I also connect and check tda 2030 x 2 amp... bass of tda 2030 is great! but less o/p power
how to rectifier my problem sir?(how to increase deep bass in tda7294?)
I think, lm3886 is good,
but,lm3886 is very costly in india
tda7294 is very cheap in indian market
please help me sir
I will wait for your reply
but,I have problem, very poor bass effect!,punching bass effect is very poor!
I also connect and check tda 2030 x 2 amp... bass of tda 2030 is great! but less o/p power
how to rectifier my problem sir?(how to increase deep bass in tda7294?)
I think, lm3886 is good,
but,lm3886 is very costly in india
tda7294 is very cheap in indian market
please help me sir
I will wait for your reply
Try changing bootstrap caps to bigger ones... Have tryed 220uF on some other TDA7294 circuit, works well, should work for this one too.
Big jumpers (wires) are there to supply other second TDA7294 chip with power. PCB V+ and V- tracks only cover one chip.
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