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Old 25th February 2011, 01:52 AM   #1
trigger is offline trigger  United States
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Default a bit o help with powertrans tda7294 and 6n11 buffer

i need power supply for theses,
24v ac 1.5a
12v ac 2a
can anyone share link for a power supply for sale,

i have $18to spend but if need be...



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i just purchased a tda7294 amp + ac-dc rectifier , with 6n11 buffer

ok i need help finding a good power supply, am a noob, so.. any help would be helpful


the seller suggested use AC24V (about 1A-1.5A),,,,, after rectifier the DC is 24V*1.414=+-34V

and 6N11 preamp use 12V (1.5A-2A)



tda amp specs
Input voltageDC 25V--38V
Output power:68W+68W
Output impedance:4-8ohm

ac-dc rectifier specs

input voltage:Max AC 33V
Output voltage: ≈ Input voltage X 1.414


pre specs
Input Voltage: AC 12V
Input impedance: 1 M Ohm
Output impedance: > 5K Ohm
Input sensitivity: 0-5V
Gain:0dB
Frequency response: 10Hz - 60KHz +/- 0.25 dB
Total harmonic distortion: > 0.0025%
SNR > 100dB
 



i have a transformer in parts box, 10.2-0-10.2 vac will this make the cut?, along with 12vac wall wart for pre?

any help is much appreciated.

Last edited by trigger; 25th February 2011 at 01:54 AM.
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Old 25th February 2011, 01:50 PM   #2
trigger is offline trigger  United States
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anything?
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Old 23rd March 2011, 05:34 PM   #3
spgjmf is offline spgjmf  United States
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Quote:
Originally Posted by trigger View Post
i need power supply for theses,
24v ac 1.5a
12v ac 2a
can anyone share link for a power supply for sale,

i have $18to spend but if need be...



Click the image to open in full size. Click the image to open in full size.Click the image to open in full size.

i just purchased a tda7294 amp + ac-dc rectifier , with 6n11 buffer

ok i need help finding a good power supply, am a noob, so.. any help would be helpful


the seller suggested use AC24V (about 1A-1.5A),,,,, after rectifier the DC is 24V*1.414=+-34V

and 6N11 preamp use 12V (1.5A-2A)



tda amp specs
Input voltageDC 25V--38V
Output power:68W+68W
Output impedance:4-8ohm

ac-dc rectifier specs

input voltage:Max AC 33V
Output voltage: ≈ Input voltage X 1.414


pre specs
Input Voltage: AC 12V
Input impedance: 1 M Ohm
Output impedance: > 5K Ohm
Input sensitivity: 0-5V
Gain:0dB
Frequency response: 10Hz - 60KHz +/- 0.25 dB
Total harmonic distortion: > 0.0025%
SNR > 100dB
 



i have a transformer in parts box, 10.2-0-10.2 vac will this make the cut?, along with 12vac wall wart for pre?

any help is much appreciated.
looks to me like you need a 12v transformer for the buffer 1 amp should be fine.

for the amps, a 24-0-24 ( or 48vct) transformer - 2 to 4 amps ( at least). 18-018 up to 24-0-24 would be ok. The 0 is for the center tap. lookup center tap transformers to learn more.

I have this one for a chip amp -


Chia Yu Co Ltd
Input: 2 X 120Vac 50-60Hz 3" Dia X 1 1/2" Tall
Output 42Vct 21V- 0 - 21V 80VA

frm apexjr. miscellaneous.html

teh 12v buffer tranny can be had anywere - wall wart, old cd player, even radio shack sells them. alos check jameco for stuff.

good luck.

Jeff
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Old 26th March 2011, 03:46 AM   #4
trigger is offline trigger  United States
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i ended up finding a 1.5 a 12ac wall wart, it seems buzzie maybe an upgrade?
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