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
Many Years ago (1981) in Italy a famous book of Amplifiers was published by PHILIPS - ELCOMA
An externally hosted image should be here but it was not working when we last tested it.
(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.
An externally hosted image should be here but it was not working when we last tested it.
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
Re: Va molto benne per qui la reproduzione parcially di schematico fratello
Here I am !
I have had to polish up everything schematics.
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
Ciao,destroyer X said:
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
Here I am !
I have had to polish up everything schematics.
Hi,Netlist said:
Unfortunately, its the only one I own.
Schematics would be nice indeed.
/Hugo
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
Attachments
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
for driver stage.
An externally hosted image should be here but it was not working when we last tested it.
http://img339.imageshack.us/img339/3174/amphschhz4.gif
An externally hosted image should be here but it was not working when we last tested it.
http://img441.imageshack.us/img441/1441/amphpcbvf9.gif
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
An externally hosted image should be here but it was not working when we last tested it.
http://img70.imageshack.us/img70/1951/amptschpy3.gif
An externally hosted image should be here but it was not working when we last tested it.
http://img69.imageshack.us/img69/8267/amptpcbwm8.gif
Gold_xyz said:
I see that Philips didn`t pay much pcb designer at that time so he decided to go for REVENGE!
bogdan_borko said:
I see that Philips didn`t pay much pcb designer at that time so he decided to go for REVENGE!
This is a PCB from years 1979/1981
bdv-bdx series
all amplifiers including some from elector magazine that used bdx or bdv series of transistors almost end up in garbage ..... of course there is not only that the design is very old ... but may be working .... but most of the problem is the darligtons .....
design like smart kit 1077 and some others ...also the john fisher amplifier all of them are based in these transistors ...... none of them really working i.e. meaning produce power except quality and also be able to produce it in 100% or more levels ..... see my post about amplifier testing and abuse
most of these transistors say example bdv 66 have internal resistors between driver and output transistor may be diferent .....
MEANING THAT AMPLIFIERS LIKE THAT ARE GOOD AND STABLE ONLY IF YOU HAVE GUARANTE NOT MATCHED BUT PAIRED TRANSISTORS ........FOR P AND N
on the contrary designs from usa like PV an Fender used the same ideas but mostly with motorola's mj 11016-15 or now days ONSEMI .... MJ 11016 which actually working like hell .....
have fun
all amplifiers including some from elector magazine that used bdx or bdv series of transistors almost end up in garbage ..... of course there is not only that the design is very old ... but may be working .... but most of the problem is the darligtons .....
design like smart kit 1077 and some others ...also the john fisher amplifier all of them are based in these transistors ...... none of them really working i.e. meaning produce power except quality and also be able to produce it in 100% or more levels ..... see my post about amplifier testing and abuse
most of these transistors say example bdv 66 have internal resistors between driver and output transistor may be diferent .....
MEANING THAT AMPLIFIERS LIKE THAT ARE GOOD AND STABLE ONLY IF YOU HAVE GUARANTE NOT MATCHED BUT PAIRED TRANSISTORS ........FOR P AND N
on the contrary designs from usa like PV an Fender used the same ideas but mostly with motorola's mj 11016-15 or now days ONSEMI .... MJ 11016 which actually working like hell .....
have fun
thank you very much indeed my dear DIY friend. i was really searching for this book. atleast i got this one in Italian. that is more than enough for me. i think philips circuits sounds good to my ears. i know it is not very high end. but it is fine for those who don't have golden ears.
thank you very much again
renjish
thank you very much again
renjish
I love Philips company, their products always excelent.
Also sonics are fine.... old International line of speakers and belt turntables were excelent too.
I would be happy to have a little bit more infomation, some description of the last amplifier... circuit description, and i suppose Italian people are very good doing that evaluated by top maximum excelence of Suonno Magazines i use to read during seventies and eigthies.
Caro fratello, me piace tu lengua, mi nona é di firenze - Italy... a piu informazzione adicionale circa dei meglio amplificatore .... sent to my mail box could be an enormous pleasure to me...can you do that...some pages, scanned, of descrizioni di circuiti.
Dear friend, i like your language, my grandmother born in Florence, Italy... some little more information about the better amplifier, sent to my mail could be an enormous pleasure to me...can you do that?.... some pages, scanned, about circuit discription?
panzertoo@yahoo.com
above the happy mail box that will be laughing, jumping and making enormous noise (as i am an italian descendent...i am noisy) if receive your material.
Habiamo pizza, fettucinni, spaghetti, caneloni,panettoni perque siamo tutti italiani buona gente.
We have pizza, fettucini, spagheti, canelone, panetone because we are all italian and good people.
Il anexo é mi nona.
Avanti centurioni!
regards,
Carlos
Also sonics are fine.... old International line of speakers and belt turntables were excelent too.
I would be happy to have a little bit more infomation, some description of the last amplifier... circuit description, and i suppose Italian people are very good doing that evaluated by top maximum excelence of Suonno Magazines i use to read during seventies and eigthies.
Caro fratello, me piace tu lengua, mi nona é di firenze - Italy... a piu informazzione adicionale circa dei meglio amplificatore .... sent to my mail box could be an enormous pleasure to me...can you do that...some pages, scanned, of descrizioni di circuiti.
Dear friend, i like your language, my grandmother born in Florence, Italy... some little more information about the better amplifier, sent to my mail could be an enormous pleasure to me...can you do that?.... some pages, scanned, about circuit discription?
panzertoo@yahoo.com
above the happy mail box that will be laughing, jumping and making enormous noise (as i am an italian descendent...i am noisy) if receive your material.
Habiamo pizza, fettucinni, spaghetti, caneloni,panettoni perque siamo tutti italiani buona gente.
We have pizza, fettucini, spagheti, canelone, panetone because we are all italian and good people.
Il anexo é mi nona.
Avanti centurioni!
regards,
Carlos
Attachments
Re: I love Philips company, their products always excelent.
Ummm Cannelloni & Lasagne with tomato sauce are very good !
Hi Carlos !destroyer X said:Also sonics are fine.... old International line of speakers and belt turntables were excelent too.
I would be happy to have a little bit more infomation, some description of the last amplifier... circuit description, and i suppose Italian people are very good doing that evaluated by top maximum excelence of Suonno Magazines i use to read during seventies and eigthies.
Caro fratello, me piace tu lengua, mi nona é di firenze - Italy... a piu informazzione adicionale circa dei meglio amplificatore .... sent to my mail box could be an enormous pleasure to me...can you do that...some pages, scanned, of descrizioni di circuiti.
Dear friend, i like your language, my grandmother born in Florence, Italy... some little more information about the better amplifier, sent to my mail could be an enormous pleasure to me...can you do that?.... some pages, scanned, about circuit discription?
panzertoo@yahoo.com
above the happy mail box that will be laughing, jumping and making enormous noise (as i am an italian descendent...i am noisy) if receive your material.
Habiamo pizza, fettucinni, spaghetti, caneloni,panettoni perque siamo tutti italiani buona gente.
We have pizza, fettucini, spagheti, canelone, panetone because we are all italian and good people.
Il anexo é mi nona.
Avanti centurioni!
regards,
Carlos
Ummm Cannelloni & Lasagne with tomato sauce are very good !
An externally hosted image should be here but it was not working when we last tested it.
Sorry for the italian food Off Topic.
Now a schematics with Bootstrap and Costant Voltage Supply.
http://img442.imageshack.us/img442/7128/ampschtb4.gif
http://img252.imageshack.us/img252/6581/amppthrf9.gif
Now a schematics with Bootstrap and Costant Voltage Supply.
An externally hosted image should be here but it was not working when we last tested it.
http://img442.imageshack.us/img442/7128/ampschtb4.gif
An externally hosted image should be here but it was not working when we last tested it.
http://img252.imageshack.us/img252/6581/amppthrf9.gif
In 1984 I have build the 100W version With BDX66C and BDX67C
and I have had this amplifier for many years .
The bootstrap circuit makes the really explosive sound !
The only negative aspect of this amplifier is the "bump"
generate from output capacitor.
For eliminate "bump" I have had to add a timing relay
for charge (at start) the capacitor.
a very little amplifier : class AB - Single (battery) supply - bootstrap - 1.2W
http://img511.imageshack.us/img511/3763/amp0eu2.gif
and I have had this amplifier for many years .
The bootstrap circuit makes the really explosive sound !
The only negative aspect of this amplifier is the "bump"
generate from output capacitor.
For eliminate "bump" I have had to add a timing relay
for charge (at start) the capacitor.
a very little amplifier : class AB - Single (battery) supply - bootstrap - 1.2W
An externally hosted image should be here but it was not working when we last tested it.
http://img511.imageshack.us/img511/3763/amp0eu2.gif
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