RE: LF: Looking for 2-3 Watt Linear PA for LF

["Gasparik Richard" <Richard.Gasparik@sbs.sk>]

Hi Brian..

How did you drive two MRF linear amplifiers in parallel ?

Rich OM2TW

> -----Original Message-----
> From:   Brian Rogerson [SMTP:brian@esoterica.pt]
> Sent:   5. december 2000 13:52
> To:     rsgb_lf_group@blacksheep.org
> Subject:        Re: LF: Looking for 2-3 Watt Linear PA for LF
>
> Geri,
>
> >Does anyone of you have a proven scheme of a small linear PA available,
> >that delivers about 2 or 3 Watts from 10 mW, preferably from 18 Volts
> >(which is the voltage used by the exciter)? I am sure a small audio
> >amplifier would do ...
>
> I have spent months fighting the TDA2030 which is only marginally stable.
>
> About three weeks ago I tried a LM1875, which has better bandwidth and
> can be used down to a closed loop gain of 10dB.  I am now using three
> (one preamp and two in a bridge circuit) to drive two of David MRF
> amplifiers in parallel.  This IC is specified for +/- 24v but seems to
> work quite happily on +/- 12v.
>
> 73, Brian
> 73 Brian     CT1DRP     IN51QD     41 09 58N  08 39 11W
> http://homepage.esoterica.pt/~brian