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G8MNY > TECH 05.01.03 13:48l 41 Lines 1369 Bytes #999 (0) @ WW
BID : 36727_GB7CIP
Read: GUEST DF7EAV OE7FMI
Subj: Dual phase AF AMP explained
Path: DB0MRW<DB0PV<OE2XOM<OE5XBL<OE3XSR<OK0PCC<OK0PAD<OK0PPL<RZ6HXA<SP7MGD<
IK6PYS<IK1ZNW<GB7CRV<GB7CIP
Sent: 030105/0928Z @:GB7CIP.#32.GBR.EU #:36727 [Caterham] $:36727_GB7CIP
From: G8MNY@GB7CIP.#32.GBR.EU
To : TECH@WW
!\ /!
___! \____ LS ____ / !____
! ! / \ ! !
! !/ \! !
________ ! !
___! PHASE !-- !
!INVERTER!_____________________________!
--------
The LS sees 2x the voltage of a normal single amp arrangement. That is 4 times
the power, eg a 4R LS with 0V & 13V DC on the AMPs may give +/- 12V peaks to
the LS. Peak power = 12 x 12 / 4 = 36W peak, = 18W RMS.
Or for typical commercial Disco amp may use say a +/- 90V 22A PSU to power a
bridged amp into 8R LS load to give a peak power 179 x 179 / 8 = 4KW peak, or
2KW RMS. Although this sounds big they are made this size!
The inverter could be just this....
-----------+ve
!
1K
____! 1u
220K !----!!-----Inverted
! !/ +
Input ---!!----!
0u1 !\e 1u
!----!!-----NON Inverted
1K +
!
------------------------------
but it is more usual to attenuate the inverted O/P of one of the amps by it's
gain factor to feed the 2nd Amp, but you do get more distortion that way.
73 De John, G8MNY @ GB7CIP
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