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Old 10th August 2012, 10:15 AM   #491
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Originally Posted by dadod View Post
Actually it is similar to the ripple on the C15(cap connected to the base of the Q30), but at much higher current. You can use small capacitance(470uF in this case) and get it multiplied and thus better filtering with less cost(transistors are cheaper then big elcos). In my amp I use separate C multipliers for input stage and output stage. One very important aspect of this is that all multipliers are very close to the stages, input or output.
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I understand how the circuit works. You can even make the ripple zero by putting a zener from base to ground. Driving stages needs ripple free supply but the needed curent is low so a resistor and zener only will fullfil the taske. The output stage doesnt need ripple free supply so why you do this?
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Old 10th August 2012, 10:19 AM   #492
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Originally Posted by dadod View Post
(transistors are cheaper then big elcos)
Much different story in the late 1980s, even today, A1244/C3263 are not exactly cheap.
Ever simulated the power supply of a Nak PA-7 ?
(a single 700VA toroidal for 2 channels, 60Vac secondaries, 4 x 33.000uF lytic bank)
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Old 10th August 2012, 10:26 AM   #493
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Originally Posted by liching1952 View Post
I understand how the circuit works. You can even make the ripple zero by putting a zener from base to ground. Driving stages needs ripple free supply but the needed curent is low so a resistor and zener only will fullfil the taske. The output stage doesnt need ripple free supply so why you do this?
No you don't.
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Old 10th August 2012, 10:30 AM   #494
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Originally Posted by jacco vermeulen View Post
Much different story in the late 1980s, even today, A1244/C3263 are not exactly cheap.
Ever simulated the power supply of a Nak PA-7 ?
(a single 700VA toroidal for 2 channels, 60Vac secondaries, 4 x 33.000uF lytic bank)
What has to be simulated? One can also just think. Even when the transistors cost nothink, a cap is better. The circuit you called cap multiplier, is known as old as the valve time but to reduce ripple further a zener is placed from basis to ground. However what is the use for the endstage? Good endstages doesnt need ripple free suply and with that circuit you lost power. Hilaric.
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Old 10th August 2012, 10:39 AM   #495
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Originally Posted by dadod View Post
No you don't.
Look to the conductance matrix of a transistor and find out that the conductance from colector to emiter is practically zero.
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Old 10th August 2012, 10:43 AM   #496
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amps need a big cap not to minimize ripple but for another reason. This is neglected and even canceled by the circuit you called C multiplier. In fact its a Cap divider. Huh?
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Old 10th August 2012, 10:55 AM   #497
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Originally Posted by liching1952 View Post
One can also just think.
The latest Dartzeel 458 monaurals each have a 2KVA toroidal with a huge oversized core, 4.5 times the nominal power rating.
Mr Hervé Delétraz is from your turf, the things cost 150K a pair, you must find that Hilarious too.
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Old 10th August 2012, 11:04 AM   #498
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The latest Dartzeel 458 monaurals each have a 2KVA toroidal with a huge oversized core, 4.5 times the nominal power rating.
Mr Hervé Delétraz is from your turf, the things cost 150K a pair, you must find that Hilarious too.
Does it use a C multiplier? If yes its hilaric, if not, big transformer is may be overkill often done in expensive amps to overwhelm foolisb customers. At least it happens 1 time in the past that a manufacturer put concreet in the amp to make it heavy=good
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Old 10th August 2012, 11:08 AM   #499
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I am sorry to intrude in this very interesting thread, but I was provoked by this guy telling nonsense about C multiplier .
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Old 10th August 2012, 11:09 AM   #500
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and foolish is a customer who buys an amp for 150k
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