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Chip Amps Amplifiers based on integrated circuits

TDA7294 + Power Transistors AMP (TDA7293 to come also)
TDA7294 + Power Transistors AMP (TDA7293 to come also)
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Old 14th April 2017, 09:16 AM   #631
Mayday is offline Mayday  Sweden
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TDA7294 + Power Transistors AMP (TDA7293 to come also)
Hmm,
I wonder if these can be used, with modifications, for the tda7293 + 2sa1943/2sc5200?
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Old 11th May 2017, 08:40 PM   #632
Mayday is offline Mayday  Sweden
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TDA7294 + Power Transistors AMP (TDA7293 to come also)
Will a 500VA 2*24Vac toroidal transformer be sufficient to power the TDA7293+2SC5200/2SA1943?
For main supply caps I was thinking 4*10000uF/63V.
The amp is to drive a pair of Dayton 15" IB woofers in H-baffles (with dipole compensation).
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Old 11th May 2017, 10:02 PM   #633
Art M is offline Art M  United States
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Originally Posted by dr frost dk View Post
f-ing dropbox changed their public folder system
Wonderful News indeed. I am totally Tired of all the External links on DiyAudio that disappear. Work within the site restrictions and attach stuff on site. If I wanted a F-Box, I could find one.
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Old 20th May 2017, 07:31 PM   #634
blackbrayn is offline blackbrayn  Romania
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Hi , just made the TDA7294 + 2 transistors version on a spider-build setup just for testing , unfortunately , i just get the distorted signal that i input (music or test signal).
I put the scope on the ouptut of the TDA7294 (pin 14) and all i get is a distorted waveform , triple-checked the connections and added 2 capacitors for decupling as close as i could to the TDA7294 thinking that maybe it shuts down or it
oscillates(like the TDA2003) , but this was not the case since the sound is not powerfull enough.
Nothing gets worm , separating the output transistors and touching the bases gets me hum in the speaker.
Any ideas?

DS1Z_QuickPrint16.png
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Old 3rd July 2017, 05:10 PM   #635
blackbrayn is offline blackbrayn  Romania
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Default TDA7294 revisited

Turns out the olt tda7294 i was using was broken , remade the whole circuit on a pcb board , managed to get aroud of 90w with 35Vx2 in a 4 ohm load @1khz sine wave , i dont have a powerfull enough PSU to increase the voltage.
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Old 14th September 2017, 11:47 PM   #636
dr frost dk is offline dr frost dk  Denmark
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EDIT: 7 years now (in this config, ATX power supply case) and still going strong, have tested a lot of amps on the side and this still works and sounds best.
And when i say 7 years i mean 10+ hours a day for 7 years, well in the last 2+ years it has been 14+ hours a day on average, as it sometimes runs 24/7 for weeks since im lazy and it only shuts off when the computer shuts off
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Old 30th December 2017, 05:47 AM   #637
Thabto is offline Thabto  Italy
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How much voltage can a TDA7293 take?
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Old 30th December 2017, 08:51 AM   #638
AndrewT is offline AndrewT  Scotland
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What advice does the manufacturer's datasheet have?
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Old 30th December 2017, 08:55 AM   #639
Thabto is offline Thabto  Italy
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What advice does the manufacturer's datasheet have?
Its described as a 120v 100w DMOS Audio Amplifier.
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Old 12th February 2018, 04:53 AM   #640
Grega is offline Grega  Australia
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Its described as a 120v 100w DMOS Audio Amplifier.
yes, thats what its described 'as'

Table 2. Absolute maximum ratings
VS Supply voltage (no signal) 60 V
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