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Old 23rd March 2012, 05:19 AM   #11
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Default TDA SERIES

check this one its NORAZMI S design
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Old 23rd March 2012, 05:45 AM   #12
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if i use 18v/2amp powersupply then how many watts spearker can i use?
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Old 23rd March 2012, 05:49 AM   #13
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crude calculations -> 18*2 = 36VA ~ 36 W, efficiency of amp ~ .6
speaker power = 36*0.6 = 21.6 W
2 speakers means, approx 10.8 W each
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Old 23rd March 2012, 05:51 AM   #14
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i have two 20w 8ohm 6'' spks can i use in parallel
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Old 23rd March 2012, 05:56 AM   #15
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You can use, but if u want good power output, get a 18-0-18V, 6-7 A transformer. 18-0-18 v after rectification and filtering will give ~ 25-0-25 V, it will give approx 35 W power to each speaker
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Old 23rd March 2012, 05:58 AM   #16
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i am not using dual power supply i am using single
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Old 23rd March 2012, 06:01 AM   #17
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then use 18-0-18 transformer in 36-0 configuration. (simply use the 18 18 wires, don't use 0 line center tap wire). basically you need a higher voltage and more current to deliver output.
But first try with the existing power supply and speakers, i you are satisfied with sound, its OK.
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Old 23rd March 2012, 06:11 AM   #18
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what about this circuit i am using this power supply is 18v/2amps
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Old 23rd March 2012, 06:21 AM   #19
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The circuit is OK. But output power depends on power supply capacity.

but for future, try to use dual supply circuit. this circuit is mainly for battery powered amplifier.
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Old 23rd March 2012, 10:02 AM   #20
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ok
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