Electronic transformer

learning

Member

• Jan 13, 2013

• #1

Can I use electronic transformer for the audio circuit as power supply need ?

Can you tell me whether the electronic transformer will compatible with audio circuit ? Actually, I want to use the electronic transformer of the LED lamp for my audio circuit. Moreover, I like to ignore the conventional transformer for my audio circuit due to its weight and big size.

 

Last edited: Jan 13, 2013

alec_t

Well-Known Member

Most Helpful Member

• Jan 13, 2013

• #2

If the 'electronic transformer' is a fixed voltage source then yes, providing the voltage and current ratings of the source are suitable for your audio equipment. However, if the LED lamp 'transformer' is a constant-current supply then probably no.

 

MikeMl

Well-Known Member

Most Helpful Member

• Jan 13, 2013

• #3

Most 'electronic tranformers' generate switching noise in the 10kHz to low MHz range. Can produce some awful results when combined with HiFi audio equipment. I would look for an older "heavy" line-frequency (50-60Hz) plug-in transformer (Wall-Wart).

 

learning

Member

• Jan 13, 2013

• #4

Thank you for your reply !

But my electronic transformer show this message on its body '12V.H.F' as also I giving you all technical details about it. So tell me whether it will work for my audio circuit as power supply. Here it is the details:

Electrical :
Input Supply 240 V ±10% 50/60 Hz.
Input Current 210 mA ± 10%
Input Power 55 VA max.
Power Factor cos Ø > 0.95
Output Voltage 12 V AC ± 5%
Output Current 4 Amp. ± 5%
Output Load 50 Watt
Output Frequency 50 KHz ±10%

Environmental :
EMI / RFI Conf. to IEC-1000-4.
Humming Noise Not at all
Ambient Temp. (Ta) 50°C max.
Max. CaseTemp (Tc) 20°C above Ta

 

MikeMl

Well-Known Member

Most Helpful Member

• Jan 13, 2013

• #5

learning said:

...
Output Voltage 12 V AC ± 5%
...

Click to expand...

You need 12V DC!

Also, there is no indication if this power supply provides isolation from the line side to the load side. If no isolation, it is a death trap!

 

alec_t

Well-Known Member

Most Helpful Member

• Jan 14, 2013

• #6

I agree with Mike; DON't use that transformer.

 

learning

Member

• Jan 15, 2013

• #7

But if I can convert the 12V AC into 12V DC through the power supply circuit which converts the AC to DC. So why it will not work for the audio circuit ? I don't understand it !

 

alec_t

Well-Known Member

Most Helpful Member

• Jan 15, 2013

• #8

Yes you could rectify the 12V AC to get DC. The peak DC voltage would be ~ 17V, which may be too high for your (unspecified) audio kit. You would also have to provide a large amount of smoothing (big capacitor) and probably components for suppression of 50kHz switching noise. Is it worth the effort?

 

learning

Member

• Jan 15, 2013

• #9

If it is possible, then what is the problem if I can try it ? If I could break the barrier, then I will lead it !

 

MikeMl

Well-Known Member

Most Helpful Member

• Jan 15, 2013

• #10

learning said:

If it is possible, then what is the problem if I can try it ? If I could break the barrier, then I will lead it !

Click to expand...

Well, there is the small matter that you may kill yourself:
"... there is no indication if this power supply provides isolation from the line side to the load side. If no isolation, it is a death trap!"

 

learning

Member

• Jan 15, 2013

• #11

OK....I will not try it ! I hope that you will be happy now !

 

alec_t

Well-Known Member

Most Helpful Member

• Jan 15, 2013

• #12

Good point, Mike!