On the associated websites I don't find any possibility for download. Also the appropriate service addresses I don't find.
Who can give me advices in this matter?
From follow models I need schematics:
1) Ibanez PQ 104
Ibanez EQ PQ 104 in Bayern - Schrobenhausen | Musikinstrumente und Zubehör gebraucht kaufen | eBay Kleinanzeigen
2) Behringer PEQ-305
http://playbiz.be/shop/media/catalo.../5e06319eda06f020e43594a9c230972d/0/1/016.jpg
Additional I want to have inside-images - maybe one of the members can upload some.
Thank you very much for your efforts..
Who can give me advices in this matter?
From follow models I need schematics:
1) Ibanez PQ 104
Ibanez EQ PQ 104 in Bayern - Schrobenhausen | Musikinstrumente und Zubehör gebraucht kaufen | eBay Kleinanzeigen
2) Behringer PEQ-305
http://playbiz.be/shop/media/catalo.../5e06319eda06f020e43594a9c230972d/0/1/016.jpg
Additional I want to have inside-images - maybe one of the members can upload some.
Thank you very much for your efforts..
That's the problem is they don't want to share them with anyone other that authorize repair shops,I suggest you do as I did get a working one and make your own drawings/measurements and repair from those.YahooGroups have some good info,Good Luck to you!
NS
NS
A repair shop owner who has a Behringer franchise said he is prohibited by legal agreement from sharing schematic diagrams for that brand. He is a frequent contributor to the PA thread on diyaudio, but not about this brand.
This is probably the only possibility. But I want to speak a Behringer guy before I start this reverse engineering, because I need the schematic to perform several upgrades like outdoor power supply, other ICs etc.
Unfortunately there isn't to find any email address or phone number by the website
BEHRINGER: Support
maybe one of the member can me give an advice for an address or name/phone number.
On the image of an opened device from this model is to see, that the parts are no SMD, but newer devices from the same model are performed in surface mounted technology, as a German guy from Behringer service center tell me.
Attachments
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Hi tiefbassuebertr,
This guy has a used unit working for 40 us,Used BEHRINGER PEQ 305 | Effects | Music Go Round Houston-North,
What is broken or not working on your unit?
This guy has a used unit working for 40 us,Used BEHRINGER PEQ 305 | Effects | Music Go Round Houston-North,
What is broken or not working on your unit?
He wants to hot rod the thing, it seems.
If I had to guess by the picture of the open sample, it's a TL074 (or maybe MC33179) grave with a 78xx/79xx power supply. Assuming circuit topologies are chosen properly, this may be entirely adequate.
If I had to guess by the picture of the open sample, it's a TL074 (or maybe MC33179) grave with a 78xx/79xx power supply. Assuming circuit topologies are chosen properly, this may be entirely adequate.
The ye old mod book first chapter said ....The power supply get's rebuilt first ,then the opamps,coupling caps ,ect,lol.
The unit works, but I want enhance the sound quality. The schematic I have in the meantime (reverse engineering), but I want to have additional the instruction- (resp. owner's- or operating-) manual) of this device so as the associated industry standart quad op amp labeled from Behringer itself.
The Behringer naming is follow: "BE037 A0021" and the pin connection is compatible to the TL074/TL084 or MC33179 but not to Raytheon's RC4136. Cause used 1,2 meg-ohm resistors at the inputs there must be internal jFET's in use for the first stage, like by the TL074/084 ones.
RC-4136 and TL074 Opamp Replacement Question
Thank you for an advice for download the owner's manual so as the industry type of the used OP-amp.
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More informations to Behringers quad operational amplifiers "BE037 A0021":
Current flow for all 7 pieces: 590mA both in positive and negative rail. This means 84mA for each quad device and 21mA for each single opa.
TL074 needs only 1,4mA typ. and 2,5mA max according data sheet.
The used supply voltage is +/-18V, created by good known voltage regulator LM317/LM337.
The device is manufactured 1992 according the used PCB.
P.S.: What means "Peak" and "Shelf" (only by the frequency areas 20-300Hz so as 1K-20K) ??
Current flow for all 7 pieces: 590mA both in positive and negative rail. This means 84mA for each quad device and 21mA for each single opa.
TL074 needs only 1,4mA typ. and 2,5mA max according data sheet.
The used supply voltage is +/-18V, created by good known voltage regulator LM317/LM337.
The device is manufactured 1992 according the used PCB.
P.S.: What means "Peak" and "Shelf" (only by the frequency areas 20-300Hz so as 1K-20K) ??
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the mentioned current flow from the last post was a misjudging resp. a
miscalculation from me. The true value is only a tenth (i. e. 10 percent) of the mentioned value, this means 59mA.
The voltage accross the serial resistors in the supply rails (between the voltage regulators and the power supply pins from the quad operational amplifiers) was 590mV, unfortunately the resistor has 10 ohms, and not according the color rings (brown-black-gold) only 1 ohm.
Various other resistors on this PCB have also values, which do not correspond to the color coding rings.
Thus all resistors I had to re-measure.
From where I can order an Owner's Manual?
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I wondered. Not even a 741 era quad op amp uses that much current.
Cool, custom marked resistors with the wrong marking. If I found a Behringer laying on the curb for the garbageman, I wouldn't pick it up. That is as bad as the Radio Shack grab bags o' rejects I used to buy in the seventies.
Cool, custom marked resistors with the wrong marking. If I found a Behringer laying on the curb for the garbageman, I wouldn't pick it up. That is as bad as the Radio Shack grab bags o' rejects I used to buy in the seventies.
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