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TDA 7293 vs STK4192 + newbie questions
TDA 7293 vs STK4192 + newbie questions
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Old 22nd October 2018, 01:40 PM   #1
pompouspompei is offline pompouspompei
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Default TDA 7293 vs STK4192 + newbie questions

Hello ,

Im new to audio systems as well as this forum. I hope this thread is in its appropriate forum , if not kindly relocate it to wherever it is deemed appropriate.

I have an old bunch of speakers and amplifiers ( both working ) from my grandfather. Unfortunately , due to the amplifier being : mono , discreet transistor based ( 2n3055 and sort) ,a cassette player input, lost schematics , im planning on building a new amp.

Getting to the point , I have :

1. 2 towers , each consisting of ( 1x Tweeter - 50W(max) 8ohm , 1x Mid- 20W 4 Ohm , and 1x Woofer - unknown wattage, 9 inch dia , 8 ohms). Now my grandpa claims that the system was 80W , so i would say that the woofer can handle a min of 40W. In addition , the tweeters 50W is its peak i guess , so its RMS would be lower . (Pics attached)

2. 1 x 30-0-30 Transformer , 4A ( I guess, it used 6A diodes in its bridge rectifier)

3. 1x 15- 0 -15 Transformer , I guess 500mA

I have a few questions , hope they arnt too noobish :

1. Any opinion on the STK4192 vs the TDA7293 in terms of audio quality , stability , heating and component quality) ? I also have alternate low powered options like the tda2030/40/50

2. Isnt i better to set a constant gain in the IC while modulating the voltage via a potential divider or op amp amplifier in the input to prevent oscillations?

3. By Power = V^2/R , the max power 2x 8 ohm speakers in series can draw if i use my 30 -0 - 30 is approx 500W. But neither the amp nor the speakers can handle it. So , am I supposed to control the Wattage via the output voltage( setting the peak voltage via the gain or some IC function)?

4. If the above is true , then the efficiency with supply of -45 to 45 V and a peak output of just 40V would see a lot of heat since at leat the tda7293 is a class AB

5. Is it worth it to keep the 30 -0 30 around? or should i replace it with a 12 -0 -12 5 Amp ? Im trying to minimze the budget by reusing the old stuff.

6. Is a 80+80W system too loud for a 300 sq feet room?

Thanks! hope these questions are clear and not too noobish!

PS : I have attached the pics of the speakers . If anyone can guesstimate or identify them , it would be great.

Click the image to open in full size.Click the image to open in full size.
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Old 27th October 2018, 01:31 AM   #2
nigelwright7557 is offline nigelwright7557  United Kingdom
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Join Date: Apr 2008
Location: Carlisle, England
Rather than buy a new power supply just don't turn the amp up full.

A living room doesn't need many watts.
I get by on a couple of watts from a USB DAC into a Fane 12-50WRMS speaker.
PCBCAD51 pcb design software. 2018 version out now with lower prices >> http://www.murtonpikesystems.co.uk
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