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Old 2nd December 2013, 07:46 AM   #1
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Default grounded collector amp

Hello
greetings could anyone please explain how is ground indicated points connected to ground power supply
warm regards
andrew lebon
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File Type: pdf RAM_MASeries_schematic.pdf (356.1 KB, 588 views)
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Old 2nd December 2013, 07:48 AM   #2
sajti is offline sajti  Hungary
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The file is psw protected, so I'm not able to open..

Sajti
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Old 2nd December 2013, 07:51 AM   #3
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password - rampass
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Old 2nd December 2013, 08:01 AM   #4
Mooly is offline Mooly  United Kingdom
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I've seen these type of circuits before. Its just drawn unconventionally that's all.

The collectors of the outputs drive the speaker (look at the symbols) with the speaker returned to the centre point of the two large reservoir caps. Signal ground is the little solid black ground symbol in the middle.
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Old 2nd December 2013, 08:05 AM   #5
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Hi Mooly
greetings its old technology just want to try it ground connection just cant get it
warm regards
andrew lebon
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Old 2nd December 2013, 08:07 AM   #6
sajti is offline sajti  Hungary
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Hi Andrew,

this inside out amplifier, has one important thing: Do not ground the transformer secondary. Just connect it to the middle point between the psu capacitors.

Anyway the drawing is quite correctly shows, how to connect the power gnd (earth symbol), and the signakl gnd (solid line).

However I have never heard this type of qsc clones sounding good...

Sajti
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Old 2nd December 2013, 08:58 AM   #7
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Its a QSC and Crown Topology..There are some explanations here.
What?!
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Old 17th November 2016, 11:16 AM   #8
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Was anyone able to simulate this properly?
I've tried several similar amps, including the qsc1700, and none work right, because of the floating supply that doesn't float to the center point at idle.
I'd like to simulate this and see how they fare.
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Old 17th November 2016, 11:27 AM   #9
forr is offline forr  France
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This is a RM Audio product which seems to be a serious manufacturer :
RAM Audio - Professional Power Amplifiers
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Old 17th November 2016, 12:48 PM   #10
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What I'd like to do is simulate the grounded collector topology.
This seems difficult, with a voltage source floating and not related to ground. This makes the slightest lack of balance in the circuit cause the rails to swing away from a central point, even if grounding the input and trying to balance things out, the rails don't split equally as they should at idle.
Those RAM amps are "borrowing" the qsc grounded collector topology, probably under some kind of arrangement between qsc and them, to allow this, but that topo is basically a qsc one.
It does have a lot in common with the crown topo, which also has the rails swing and an amp output tied to ground, except that qsc has all the output devices with their colllectors grounded. This is a huge advantage for power dissipation, no need to isolate the device cases from anything, as they're all grounded, so there is no need for extra thermal resistance between cases and the heatsinks. This can make for smaller heatsinks and more compact amps, especially with the simpler power supplies.
Now since this topo has the signal passing right through the filter caps, this kind of makes those amps somewhat "safer" for the speakers, as the dc faults are less dangerous, but those amps don't pass dc and having the signal going through the caps can make for more distortion.
I want to find out how to make the simulation work.
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