André
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« Reply #30 on: July 28, 2006, 05:30:14 AM » |
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Now I ordered 2 x AD633JN plus 2 x AD633JNZ plus 2 x AD781JNZ. Thanks for the tip with free samples from analog!  |
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André
phpBB Junior Member
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« Reply #31 on: July 31, 2006, 02:52:36 AM » |
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Now I see that I need a +/- 15v power supply to the ring mod with LFO circuit in the archives. How do I do that? Can I by something to put in the wall or do I have to build a special psu?
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bugbrand
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« Reply #32 on: July 31, 2006, 11:18:46 AM » |
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It'd almost certainly work just fine with 2 x 9volt batteries to give +/- 9v
(but double check the AD633 datasheet to make sure it can run off that supply)
Otherwise, yes, bipolar powersupply..
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André
phpBB Junior Member
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« Reply #33 on: August 01, 2006, 02:51:38 AM » |
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It can be runned by -+9v according to the sheet. But i guess there is a reason that they have chosen +-15V in the schematic. is a bipolar 15V psu expansive?
I think I'm gonna need a 15 or 12v +- psu in the future anyway so I think I have to get it. Can I build one myself?
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expanoncolin
Administrator
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« Reply #34 on: August 01, 2006, 09:30:12 AM » |
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Yes, it will likely work on +/-9V. +/-15V is a common voltage source for modular synthesizers. To procure such a power supply would not be difficult.
-Colin
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André
phpBB Junior Member
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« Reply #35 on: August 01, 2006, 12:12:01 PM » |
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Thanks for the answers. I found a schem for a 12v on musicfromouterspace.com that I'm probobly will build if anyone here don't have a better suggestion.
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André
phpBB Junior Member
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« Reply #36 on: August 04, 2006, 06:45:36 AM » |
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Just one more question:
I'm looking at the ring mod with lfo in the archives and wonder how many TL072 are there? Why is there no IC3B, IC4B or IC5B? Is it something That I don't understand? The TL072 is dual, right?
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expanoncolin
Administrator
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« Reply #37 on: August 04, 2006, 02:44:01 PM » |
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Looks like it's labeled wrong. You will need 3 TL072's. One of them should be for the LFO. The other two, it doesn't matter. One op amp iwll be unused on one of the TL072's.
-Colin
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André
phpBB Junior Member
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« Reply #38 on: August 05, 2006, 09:11:55 AM » |
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Looks like it's labeled wrong. You will need 3 TL072's. One of them should be for the LFO. The other two, it doesn't matter. One op amp iwll be unused on one of the TL072's.
-Colin OK, thanks. Then I understand. So I can use a TL071 instead of the third 072. |
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expanoncolin
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« Reply #39 on: August 05, 2006, 09:48:11 PM » |
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OK, thanks. Then I understand. So I can use a TL071 instead of the third 072. If you want. Either will work. -Colin |
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André
phpBB Junior Member
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« Reply #40 on: August 10, 2006, 04:24:48 AM » |
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Ok, I had one more question. Shall pin 4 and 8 on the 072's be connected to + and - (or ground maybe)? Maybe that goes without saying but I'm new to this.
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expanoncolin
Administrator
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« Reply #41 on: August 10, 2006, 10:33:41 AM » |
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Ok, I had one more question. Shall pin 4 and 8 on the 072's be connected to + and - (or ground maybe)? Maybe that goes without saying but I'm new to this. That circuit is designed for +/-15V-you are going to need to connect V+ to 15V, and V- to -15V. -Colin |
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cloudscapes
phpBB Member
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« Reply #42 on: December 18, 2006, 08:44:51 AM » |
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Right, I recieved my AD633JN chips this morning. I want to try a passive ringmod using transformers eventually, but I don't have em yet so I'm going to see what I can do with these cjips.  |
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