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Old 20th November 2012, 07:22 AM   #11
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I am change project :because power transformer 500va not cheap & ....
now my project is : Single Supply High Power Amplifier TDA2030A + npn/pnp :

http://elcircuits.com/single-supply-...or-bd908-bd907

severl question :
1- whats way to increase power of this circuit ?
2- TIP36B & 2N3055 IS woking in this circuit or not? how many change circuit with use these Transistors
3- best circuit of two : Single Supply TDA2030A BD907 BD908 or TDA2030A Bridge with split power supply 34w Vs-+16
( DC VOLTAGE of my Transformer is 29 v )
4- what is way to increase current of transistor output without voltage increaseing ( darlington for every npn and pnp or parallel transistor)

please guide me to
regad .
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Old 20th November 2012, 07:39 AM   #12
Boscoe is offline Boscoe  United Kingdom
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Forget these build an LM3886 amp.
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Old 20th November 2012, 07:51 AM   #13
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Quote:
Originally Posted by Boscoe View Post
In theory with enough output pairs and bridged they could achieve 200Wrms 4R. The voltages work out whether the TDAs are actually up to the job or something else gets in the way I don't now.
Yeah it is a bridged configuration, the TDA's don't get to see such a low load. The resistors in their respective supply lines open the shunt transistors to supply the rest of the current; they can handle it. However, the design is a bit frowned upon because it's an exploitation of an "undocumented" feature (putting a minor load in supply lines of the 2030), hence it was stressed in the documentation going with the scematic that close attention should be paid to proper decoupling. (C6 in the last schematic, left side)
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Last edited by MagicBox; 20th November 2012 at 07:53 AM.
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Old 20th November 2012, 07:56 AM   #14
Boscoe is offline Boscoe  United Kingdom
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Hmm yes it will be likely to be unstable due to not being able to decouple the TDA directly.
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Old 20th November 2012, 08:08 AM   #15
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Yes, had to do with stability It was a kit produced by Velleman a long time ago, could be over 20 years. There was no supply. The nice thing about this kit was that it was capable of a relatively high power output while being pretty DIY friendly for journeyman engineers
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Old 20th November 2012, 08:14 AM   #16
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What is power of resistor (2.2 ohm and 1ohm and ...)
please read Elector octobr 1986 MAGAZINE.
if link of english version is AVAILABLE?
please post me
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Old 20th November 2012, 06:23 PM   #17
sregor is offline sregor  United States
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FWIW circuit is straight from ST electronics data sheet (not an undocumented feature) http://www.st.com/internet/com/TECHN...CD00000129.pdf page 7
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Old 20th November 2012, 06:51 PM   #18
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I guess I was wrong about that part then, the top of the datasheet even mentions the use as 35W driver. It's what I remembered from way back when I played with the circuit, which is different from the circuit in the datasheet. I distinctly remember about the decoupling for that particular circuit
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Old 20th November 2012, 08:40 PM   #19
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Quote:
Originally Posted by MagicBox View Post
I guess I was wrong about that part then, the top of the datasheet even mentions the use as 35W driver. It's what I remembered from way back when I played with the circuit, which is different from the circuit in the datasheet. I distinctly remember about the decoupling for that particular circuit
hi
my english is poor please elucidate youer intention ...
sorry....
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Old 21st November 2012, 05:27 AM   #20
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1 ohms can be 1 Watt. I couldn't see 2.2

Gajanan Phadte
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