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Re: LF: RE: Re: TDA2003, TDA2030 for PA?

To: <[email protected]>
Subject: Re: LF: RE: Re: TDA2003, TDA2030 for PA?
From: "Graham" <[email protected]>
Date: Wed, 25 Mar 2009 19:28:27 -0000
Importance: Normal
In-reply-to: <[email protected]>
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G..

Just checked ... power -3 db at 140 Khz .. but the gain/bw plot shows 20 db gain at 500 K but that's running with 'no' compensation ... so may be a little 'wild' hihi
G ..


B Power Bandwidth
(-3 dB)
Gv = 30 dB
Po = 12W RL = 4W 10 to 140,000 Hz



--------------------------------------------------
From: "Gary - G4WGT" <[email protected]>
Sent: Wednesday, March 25, 2009 4:03 PM
To: <[email protected]>
Subject: LF: RE: Re: TDA2003, TDA2030 for PA?

Hi Petr,

I have tested a TDA2030 for a 500KHz driver & is OK for 136KHz as other
authors have stated.

It does fall off very rapidly from 200KHz & higher & is of no use at 500KHz.
73

Gary - G4WGT.



-----Original Message-----
From: [email protected]
[mailto:[email protected]] On Behalf Of Hugh_m0wye
Sent: 25 March 2009 15:01
To: [email protected]
Subject: LF: Re: TDA2003, TDA2030 for PA?

I successfully made a TDA2030 amplifier which i used for all my intial
experimenting on 137kHz
Photo http://www.m0wye.radiouk.com/lfamp.jpg
The data sheet for this IC claims a bandwidth of 140kHz so it won't work on
500kHz.
I think I got about 6Watts out. Not all the audio ICs have as much bandwidth
as this.
You need a matching circuit on the output to convert the low impedance of
the amp to 50 ohms - or whatever your antenna system uses.
73
Hugh M0WYE




----- Original Message ----- From: "Petr Malý" <[email protected]>
To: <[email protected]>
Sent: Wednesday, March 25, 2009 1:38 PM
Subject: LF: TDA2003, TDA2030 for PA?


Hi all,

My intention is to build a small transmitter up to some 10W for 136 and 505
kHz, this time not the D class, but B or AB class.
I think of employing AF amplifiers such as TDA2003, TDA2030, or similar. Of course, mainly 505 kHz is rather out of range so that nothing is guaranteed.
This is why I ask before experimenting.
Did anybody try to use these for 136/505 kHz?

Tks, 73, Petr, OK!FIG
http://ok1fig.nagano.cz







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