Kenwood Basic M2 - Intriguing Circuitry - Page 2

sreten · 28th May 2004, 06:07 PM

Quote:

Originally posted by SVI2004A

- from my knowledge of output devices this amplifier workd like a four barrel carburettor - the LV rail handles the signal till the level requires the HV rail to switch in for higher signals
Regards Baily

The nearest to this is the Edwin topology, but no real advantage.

sreten.

K-amps · 28th May 2004, 06:33 PM

The LV OP runs till it is close to it's rails then the TA2031 switches the audio signal to the higher HV OP stage.

The switching is such that they never conduct simultaneously.

It is also not that the LV OP's handle a clipped signal and the HV provides the additional "crest" of the sinewave, but that lets just says that given a single cycle of a sinewave, and assume it represents a bell shaped curve, 2 standard deviations are handled by the HV OP and the rest by the LV OP stage.

The obvious advantage is that no set of outputs sees greater than +/-50 vdc or so across their CE's so dissipation is very low.

K-

SVI2004A · 28th May 2004, 06:41 PM

so under HV the LV will be reverse bias, eliminating V drop over output devices (i noted theese large diodes)

Dan Mattis · 22nd June 2004, 01:44 AM

I have the Kenwood Basic M2A Service manual that I have scanned at 600dpi and burned on CD. I list this on eBay from time to time. If anyone is interested, I can relist it.

K-amps · 22nd June 2004, 02:42 AM

Lookie here, If it isnt my old buddy Dan!!

Hows it going?

- Arif.

rozan74 · 17th March 2008, 12:58 PM

hi all,

does anyone here have a M2A manual?

cheers - neil

GEirin · 17th March 2008, 10:05 PM

Hi.

Here M2A.

GEirin

GEirin · 17th March 2008, 10:12 PM

hi.

GEirin · 17th March 2008, 10:23 PM

OK.

GEirin · 17th March 2008, 10:40 PM

OK

28th May 2004, 06:41 PM	#13
SVI2004A diyAudio Member Join Date: Mar 2004 Location: Albany Western Australia	does this sound right? so under HV the LV will be reverse bias, eliminating V drop over output devices (i noted theese large diodes) __________________ .:Ride the Lightning...Feel the Thunder:. - Technics Triple Thunder www.welcome.to/Technics oh yes ppl plz send me them dead (or Alive) STK or SVI ICs

22nd June 2004, 01:44 AM	#14
Dan Mattis diyAudio Member Join Date: Jun 2002 Location: Colorado	Kenwood Basic M2A Schematic I have the Kenwood Basic M2A Service manual that I have scanned at 600dpi and burned on CD. I list this on eBay from time to time. If anyone is interested, I can relist it.

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28th May 2004, 06:33 PM	#12
K-amps diyAudio Member Join Date: Nov 2003 Location: Indiana	The LV OP runs till it is close to it's rails then the TA2031 switches the audio signal to the higher HV OP stage. The switching is such that they never conduct simultaneously. It is also not that the LV OP's handle a clipped signal and the HV provides the additional "crest" of the sinewave, but that lets just says that given a single cycle of a sinewave, and assume it represents a bell shaped curve, 2 standard deviations are handled by the HV OP and the rest by the LV OP stage. The obvious advantage is that no set of outputs sees greater than +/-50 vdc or so across their CE's so dissipation is very low. K-

22nd June 2004, 02:42 AM	#15
K-amps diyAudio Member Join Date: Nov 2003 Location: Indiana	Lookie here, If it isnt my old buddy Dan!! Hows it going? - Arif.

17th March 2008, 12:58 PM	#16
rozan74 diyAudio Member Join Date: Mar 2008	hi all, does anyone here have a M2A manual? cheers - neil

17th March 2008, 10:05 PM	#17
GEirin diyAudio Member Join Date: Jun 2004 Location: Mendoza	Hi. Here M2A. GEirin

17th March 2008, 10:12 PM	#18
GEirin diyAudio Member Join Date: Jun 2004 Location: Mendoza	hi.