Dual La2a - [silent:arts] version
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how much is "a bit" ? (LA2As are not famous for low noise)waldorfcave hat geschrieben:gain ratio have to be tuned like volker said (i use sowters) i do it later....
one problem is, that my unit hums a bit. more then it is ok for me
is the hum constant or gain depended ?
volker
olafmatt hat geschrieben:Strom kann tot machen
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Did you mount the 7805 isolated from heatsink and caseground? Doppelkühlung You may have a ground loop. Is hum frequency pre (mains side) or post rectifier (double mains frequency)?
-Harpo
-Harpo
mische lauter - Ohren wachsen nach
Ist mir Scheißegal wer dein Vater ist. Solange ich am Angeln bin, gehst Du hier nicht übers Wasser !
Ist mir Scheißegal wer dein Vater ist. Solange ich am Angeln bin, gehst Du hier nicht übers Wasser !
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7805 is isolated, i checked without heatsink...
shielded wire for pots and xlr, output tranny has no shielded wire...
i disconnected the ac heaters from other side and nothing happens
rewireing of the ac heater not helped
for info: hum is there also when nothing is connected to input
later i will measure the hum
shielded wire for pots and xlr, output tranny has no shielded wire...
i disconnected the ac heaters from other side and nothing happens
rewireing of the ac heater not helped
for info: hum is there also when nothing is connected to input
later i will measure the hum
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here u can see and listen to my hum
direct patch the output of one side in my motu hd192 converter
http://www.waldorfcave.com/humla2a.wav
direct patch the output of one side in my motu hd192 converter
http://www.waldorfcave.com/humla2a.wav
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at first I thought the soundfile is empty - never try to hear this on the Computer
but in Pro Tools I can hear it. compared to mine: yes, there must be something wrong
mhm - have to think about it ...
may be do the Gain pot change first.
Bernd, the black wires from the 8940 are grounded on the PCB.
but in Pro Tools I can hear it. compared to mine: yes, there must be something wrong
mhm - have to think about it ...
may be do the Gain pot change first.
Bernd, the black wires from the 8940 are grounded on the PCB.
it is just the 3rd layer of the PCBThe HT wiring is a real pita.
volker
olafmatt hat geschrieben:Strom kann tot machen
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25K log is even better. the 75K resistor goes between pin3 of the pot and pin3 of the molex connector. (the circuit stil sees a 100K pot, but you can only move it from 0R to 25K). less gain, but even with this "mod" I never went behind the middle of it.
volker
olafmatt hat geschrieben:Strom kann tot machen
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whats about with this "grid stopper" thing?
i read a lot in prodpro forum. should i try it?
http://www.prodigy-pro.com/forum/viewtopic.php?p=258781
i read a lot in prodpro forum. should i try it?
http://www.prodigy-pro.com/forum/viewtopic.php?p=258781