From Italian PHILIPS ELCOMA (1981)

Gold_xyz · 28th May 2007, 05:12 PM

Hi to all

Many Years ago (1981) in Italy a famous book of Amplifiers was published by PHILIPS - ELCOMA

(This is a collection of Application Note published by firm PHILIPS S.p.A. Italia)
http://www.philips.it/

Parts of this Book can be reproduced with condition to quote the Author.

The Book start with hybrid IC OM 931 (30W) and OM961 (60W)
and continue with transistor amplifiers up to 100W

Many of these Amps are with single supply, bootstrap cap. and
darlington end stage.
Others amps are with simmetrical supply and CCS without bootstrap.

The only problem is that the end-stage bjt can be out of production... BDX66C BDX67C BDV64A BDV65A

destroyer X · 28th May 2007, 08:00 PM

Will be very interesting to have some reproduction of schematic here my friend.

If you can post some....please, go ahead.

Avanti leggionario!

saluti

Carlo

Netlist · 28th May 2007, 08:08 PM

Unfortunately, its the only one I own.
Schematics would be nice indeed.

/Hugo

Gold_xyz · 28th May 2007, 10:19 PM

Quote:

Originally posted by destroyer X

Will be very interesting to have some reproduction of schematic here my friend.

If you can post some....please, go ahead.

Avanti leggionario!

saluti

Carlo

Ciao,
Here I am !

I have had to polish up everything schematics.

Quote:

Originally posted by Netlist

Unfortunately, its the only one I own.
Schematics would be nice indeed.

/Hugo

Hi,

Here is the schematics....
This is single supply in three version (25/50/100W 4 Ohms)

Source of Schematics, PCB, PTH :
PHILIPS ELCOMA S.p.A. Piazza IV Novembre 3 - 20124 MILANO
From BOOK "Amplificatori di Bassa frequenza e Hi-Fi"
3rd edition - Jan 1981

Gold_xyz · 28th May 2007, 10:21 PM

PART LIST

Gold_xyz · 28th May 2007, 10:24 PM

PCB

Gold_xyz · 28th May 2007, 10:33 PM

PTH (132KB)

direct link:
http://img516.imageshack.us/img516/6715/pthey9.gif

Gold_xyz · 29th May 2007, 06:11 PM

This other schematics use a CCS for decoupling the supply
for driver stage.

http://img339.imageshack.us/img339/3174/amphschhz4.gif

http://img441.imageshack.us/img441/1441/amphpcbvf9.gif

Gold_xyz · 29th May 2007, 06:39 PM

Also this is for double supply with bootstrap & CCS

http://img70.imageshack.us/img70/1951/amptschpy3.gif

http://img69.imageshack.us/img69/8267/amptpcbwm8.gif

destroyer X · 29th May 2007, 06:46 PM

Veramente bello schematico.

Grazie.

Very good and pretty schematic.

thanks,

Carlos

28th May 2007, 05:12 PM	#1
Gold_xyz diyAudio Member Join Date: Dec 2005 Location: Italy	From Italian PHILIPS ELCOMA (1981) Hi to all Many Years ago (1981) in Italy a famous book of Amplifiers was published by PHILIPS - ELCOMA (This is a collection of Application Note published by firm PHILIPS S.p.A. Italia) http://www.philips.it/ Parts of this Book can be reproduced with condition to quote the Author. The Book start with hybrid IC OM 931 (30W) and OM961 (60W) and continue with transistor amplifiers up to 100W Many of these Amps are with single supply, bootstrap cap. and darlington end stage. Others amps are with simmetrical supply and CCS without bootstrap. The only problem is that the end-stage bjt can be out of production... BDX66C BDX67C BDV64A BDV65A __________________ My English originates from here

28th May 2007, 08:00 PM	#2
destroyer X diyAudio Member Join Date: Feb 2004 Location: Recife - Brasil Northeast	Va molto benne per qui la reproduzione parcially di schematico fratello Will be very interesting to have some reproduction of schematic here my friend. If you can post some....please, go ahead. Avanti leggionario! saluti Carlo __________________ Try to build an amplifier folks ... it is pure adrenaline!

28th May 2007, 10:33 PM	#7
Gold_xyz diyAudio Member Join Date: Dec 2005 Location: Italy	PTH (132KB) direct link: http://img516.imageshack.us/img516/6715/pthey9.gif __________________ My English originates from here

29th May 2007, 06:11 PM	#8
Gold_xyz diyAudio Member Join Date: Dec 2005 Location: Italy	This other schematics use a CCS for decoupling the supply for driver stage. http://img339.imageshack.us/img339/3174/amphschhz4.gif http://img441.imageshack.us/img441/1441/amphpcbvf9.gif __________________ My English originates from here

29th May 2007, 06:39 PM	#9
Gold_xyz diyAudio Member Join Date: Dec 2005 Location: Italy	Also this is for double supply with bootstrap & CCS http://img70.imageshack.us/img70/1951/amptschpy3.gif http://img69.imageshack.us/img69/8267/amptpcbwm8.gif __________________ My English originates from here


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29th May 2007, 06:46 PM	#10
destroyer X diyAudio Member Join Date: Feb 2004 Location: Recife - Brasil Northeast	I am enjoying your posts...thank you very much Veramente bello schematico. Grazie. Very good and pretty schematic. thanks, Carlos __________________ Try to build an amplifier folks ... it is pure adrenaline!

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