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RE: LF: TDA7498 2x100W audio PA for LF use ??

To: "[email protected]" <[email protected]>
Subject: RE: LF: TDA7498 2x100W audio PA for LF use ??
From: VIGILANT Luis Fernández <[email protected]>
Date: Wed, 9 Dec 2015 10:37:34 +0000
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Thread-topic: LF: TDA7498 2x100W audio PA for LF use ??
Hi Hugh
 
Were did you got the kit ? Is it still available ?
 
73 de Luis
EA5DOM


De: [email protected] [mailto:[email protected]] En nombre de LineOne
Enviado el: martes, 08 de diciembre de 2015 12:07
Para: [email protected]
Asunto: Re: LF: TDA7498 2x100W audio PA for LF use ??

I bought a 300W amplifier kit, all the small transistors have an "ft" in the VHF region and the power transistors ft is 15MHz. Small modifications include changing the Zobel network and bypassing some electrolytics with 100nF. Latterly I have fitted 250V power transistors to replace the 150V, some spikes were liable to "kill" the originals.
It gives me 300W dc input, about half available as RF power. Forced cooling is necessary.


On 08/12/2015 09:41, VIGILANT Luis Fernández wrote:
Hi LF

I have read about using old TDA2010 audio modules as exciter stages for LF amplifiers

Searching the web have found that there is actually a bunch of cheap audio amplifiers based
in TDA7498 which is 2x100W. I wonder if this worths to get some watts into LF. Mat be the
two outputs can be also combined if feeded ati phase ?

Have a look at one of this here

73 de Luis
EA5DOM

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