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Author Topic: DPA MPS6010  (Read 860 times)

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Offline jerryfreak

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DPA MPS6010
« on: July 22, 2019, 11:26:46 PM »
can this circuit be tweaked?

its a dual purpose battery box that can either transform P48 from the xlrs into microdot power, or use the 9V to provide microdot power. problem being, like other DPA solutions its drops the voltage from 9V to ~2.5V under load. Ive been told by Bruce Myers and Len and others that best results for mini DPAs is ~8V. Im not sure about the new microdot-powered full sized actives, hard to get a straight answer from DPA anymore

so id like to:
a)increase voltage to mic by swapping some resistors
b)pull off an unbalanced out and put a female trs jack in the case. would i just pull off pin 2 and leave pin 3 float in that case?

the red caps are larger than the purple ones. red are non-polarized, purple are polarized, both are 50V 10uF. From the XLRs black=pin1, red=pin2, yellow=pin3. the black and red wires at the top of the first pic go to the microdot mic connectors

the entire perimeter of that board layout as well as the two cross-connections under the resistors are all ground common to the battery, XLRs, and microdot connections

not sure what the small gold things are, i get random resistance measurements on those which should be a symmetrical 2-channel circuit. are they small caps or something?





« Last Edit: July 22, 2019, 11:56:49 PM by jerryfreak »
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Offline jerryfreak

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Re: DPA MPS6010
« Reply #1 on: July 22, 2019, 11:39:57 PM »
some of the hidden traces illustrated in pink

in:
small: MK4/4V > CMR > V3 or J.Williams Mod MicMan Jr or no pre at all >AD2K/R07/PCM-A10/Oade Warm 661/DR100-MKIII

smaller: 4061/4099 CORE or 4011/4018V> d:vice MMA



out:
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shop: Musical Fidelity VLink 192 Asynchronyous> coax> DAC1 > Rokit RP8 active monitors

Offline Sebastian

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Re: DPA MPS6010
« Reply #2 on: July 23, 2019, 01:58:07 AM »
not sure what the small gold things are, i get random resistance measurements on those which should be a symmetrical 2-channel circuit. are they small caps or something?

Could these be diodes?
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Offline jerryfreak

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Re: DPA MPS6010
« Reply #3 on: July 23, 2019, 02:46:58 AM »
not sure what the small gold things are, i get random resistance measurements on those which should be a symmetrical 2-channel circuit. are they small caps or something?

Could these be diodes?

interesting ill test them with diode beep tester
in:
small: MK4/4V > CMR > V3 or J.Williams Mod MicMan Jr or no pre at all >AD2K/R07/PCM-A10/Oade Warm 661/DR100-MKIII

smaller: 4061/4099 CORE or 4011/4018V> d:vice MMA



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Offline H₂O

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Re: DPA MPS6010
« Reply #4 on: July 25, 2019, 09:29:54 PM »
They look like diodes to me. - The black ring is the output side (or what points in the direction of current flow) - You do get a voltage drop across any diode and it can be substantial


Usually in power supplies they are used either for protection or slight voltage adjustments or both


Also note that the caps in the pics look like typical electrolytic caps which are almost always polarized - see [size=78%]https://en.wikipedia.org/wiki/Electrolytic_capacitor[/size]
[/size][size=78%]  [/size]
« Last Edit: July 25, 2019, 09:34:12 PM by H₂O »
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Offline H₂O

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Re: DPA MPS6010
« Reply #5 on: July 25, 2019, 09:36:47 PM »
They are called glass diodes
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Offline jerryfreak

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Re: DPA MPS6010
« Reply #6 on: July 26, 2019, 02:31:46 AM »
They are called glass diodes

makes sense. its not apart right now, and opposite ones did show OL across them (as opposed to the symmetrical diode on the other channel that i was measuring with correct polarity)
in:
small: MK4/4V > CMR > V3 or J.Williams Mod MicMan Jr or no pre at all >AD2K/R07/PCM-A10/Oade Warm 661/DR100-MKIII

smaller: 4061/4099 CORE or 4011/4018V> d:vice MMA



out:
home:Benchmark DAC1 HDR > Dynaudio BM15A active monitors
shop: Musical Fidelity VLink 192 Asynchronyous> coax> DAC1 > Rokit RP8 active monitors

Offline Len Moskowitz (Core Sound)

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Re: DPA MPS6010
« Reply #7 on: July 26, 2019, 08:15:19 AM »
(This will get technical.)

It's not quite correct to think that a capsule's power supply must always stay at a specific voltage. It's a Power supply - meaning a Watt supply - not a Volt supply.

When you see the voltage drop when the capsule is exposed to a loud sound source, what you're seeing is that it's drawing more current across the power supply's (the battery) internal series resistor. (The resistor may function as a current limiting resistor.) That's perfectly fine as long as the power supply can supply enough current, and the resulting under-load voltage is adequate to allow the capsule to capture the sound pressure level without distorting. So the ~2.5V you're measuring might be just fine.

Assuming that your voltage source (the battery again) can provide enough current, selecting the right voltage is an exercise in selecting a voltage that's high enough to allow for high sound pressure levels, and not so high that it will destroy the FET inside that capsule. Equally important is the value of the series resistor. Like much of engineering, it's a balancing act of trade-offs.
« Last Edit: July 26, 2019, 08:27:03 AM by Len Moskowitz (Core Sound) »
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