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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