posted
Hey techman, you seem to be the resident "know everything" just wondering what you like to use as a power supply for op-amps, i've used a few dif methods, dc-dc converters... and pos/neg (7815/7915) regulators off the supply rails of an amp.... ideas? thanx man
------------------ 9 12's in the hatch of a golf
[This message has been edited by RWAudio (edited 11-27-1999).]
Posts: 735 | From: Calgary AB | Registered: Oct 1999
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Yikes, resident know everything? Sounds loaded.... Anyway, I've used both your methods... You got an amp there anyway, add a 7815 and 7915 and use that to power some op-amps your adding for whatever purpose. And of course you could always regulate without IC's by using Zener diodes, transistors and a few support components.
Building a conventional DC to DC coverter is also a good way to go. I prefer the TL494 and always use mosfets to do the power switching. I prefer allowing regulation as well. Then just build to size.
There is another form of supply utilizing a quad nand gate and some diodes and caps to make a voltage doubler. This allows a real simple way to come up with + and - supply greater than 6 + 6, but not as high as 15 + 15. I could try to get a schematic up if you would like. This is definitely a more generic way to get the job done.
'Where there's a will there's a wall' 'Would you like a little SQ with your SPL?'
Posts: 926 | From: Sugarland, Tx | Registered: May 1999
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thanx Tech... schematics to any and all of those would be great... basically i need two power supplies.. one to power a single op amp.. for a line driver.. and one to power multiple opamps... for an eq.. and what op amps do you like? have you played with the Burr Brown opa134 series... very nice.. and inexpensive later
------------------ 9 12's in the hatch of a golf
Posts: 735 | From: Calgary AB | Registered: Oct 1999
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posted
ahh, what the hell do you know anyways tech, get this guy some specs, I want to try out his line driver when it's finished. It'll be his team hertz initiation project
------------------ Shaughn Murley Extreme Audio By Design TEAM HERTZ CANADA Western Regional Manager
Posts: 128 | From: Red Deer, AB, Canada | Registered: Nov 1999
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haha thanx Extreme... the line drivers gettin there.. just lookin for ways to bring the cost down... you'll be the first to get one.. promise Posts: 735 | From: Calgary AB | Registered: Oct 1999
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I'll work on it tonight. I generically use 4559's for general purpose use. (common op amp in mid-line amps) and The TL072/074 for higher level work (fet type op amp) I don't do high end SQ work in custom electronics so I never try to push the limit in op amp spechs. I'm generally doing SPL projects when it comes to custom circuitry. This of course doesn't require much SQ...burp burp.
'Where there's a will there's a wall' 'Would you like a little SQ with your SPL?'
Posts: 926 | From: Sugarland, Tx | Registered: May 1999
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This is a short sweet to the point device to bridge most mono amps to each other when they don't already come with a switch. Like the RF mono-blocks. I believe moneybag used this to put his memphis together and this will work with old amp that don't have bridging built in, like old orion amps that need a bridging module. This circuit takes into account use of a standard dual op amp like the 4558, 4559, 1458 or any other similar type. You will need at least a + and - 9 volts to operate this and I would suggest a + and - 15 volts to allow work with high line decks or line drivers. Hope this helps
This circuit is good for a + and - 10 volt supply (or so). This circuit has been around for a while and does a satisfactory job. Some of the cheaper manufacturers will even use this to power an entire multi point x-over so you get the just that this can drive many op amps.
This is an abbreviated (read incomplete) schematic for an all out dc to dc switching supply. You have a pwm ic, mosfet switches, a toroid transformer, well the list goes on. This project is for the advanced so I wouldn't suggest it to anybody to hasn't built some intricate stuff. I can work up a complete schematic if you want.. It will take a while since I don't have one worked up that isn't designed for an amp instead of a preamp.
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thanks man I'll play around with the middle one. would work great for a x-over/small eq but there would be a limit to the input/output signal.. your bridging module is almost the same as what i designed... (when I get my 1000D's) I just used a Quad op amp and gave it some gain too.. but i guess that's my habbit of turning everything into a line driver.
------------------ 9 12's in the hatch of a golf
Posts: 735 | From: Calgary AB | Registered: Oct 1999
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posted
Hey Techman one last thing. the cap in the middle diagram bottom left... 470pF? or? and what transistors do you usually use for that?
Posts: 735 | From: Calgary AB | Registered: Oct 1999
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posted
If I remember right it's a .oo47uf cap, mylar. The transistors or general purpose use, I use the 2SC1027 and 2SA1023 since these are cheap and everywhere. You can sub if you want without a problem
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