http://prophecysound.com/images/fp01.jpg
I'm working on a clone of the flying pan for a customer, and have got the phaser LFO section happening (I subbed 2N3904s for the 2SC828s) but it doesn't quite work properly - the LEDs increase and decrease in brightness a little, but not much, and they are too bright to start off with. Before I dig in and mess around with the biasing, can anyone make stab at what values 1), 2) and 3) are on the schematic portion above? I think this is the cause of the problem.
TIA
Mike
Mike, this is what I get when I click the link to the schemo:
Forbidden
You don't have permission to access /images/fp01.jpg on this server.
Oops ... I have hotlink protection on to stop people direct linking. It should be fixed now, I think - worked for me clicking on the above link.
Cheers
Mike
naw, still get a "403" plus this:
You don't have permission to access /images/fp01.jpg on this server.
Additionally, a 404 Not Found error was encountered while trying to use an ErrorDocument to handle the request.
--------------------------------------------------------------------------------
Apache/1.3.27 Server at www.prophecysound.com Port 80
You prob. see it, `cause it`s in your "TEMP"...
I have no idea about what you are asking, sorry. But I thought I would chime in to say that the link works fine now... or works for me at least.
Matt.
...still can`t see it
1 = dah, not sure. 4K maybe? Not a standard 5% value, but then there's a 1.1K listed somewhere below...maybe 41K?
2 = 43K perhaps?
3 = 100K (I'm most sure bout that one)
1) 41K with 6.2K below that
2) 43K ?
3) 100K
Good luck,
-Peter
1: 7 k with 6.2 k below
2: 4.7k
3: 100k
Curiously enough, that url doesn't work for me either! (tried it just now for the first time)
(http://users.rio.com/senorris/junk/fp01.gif)
I bet 2 is not 4.7K, cause another 7 in the image is not done with the strike-through (european style). Then again, maybe I'm assuming too much consistency on the part of the author!
Here's a question, why do so many schematics on the web look like this?
Sam, it's because people hand-draw them and then are too lazy to make a proper digital version :P
Well, right, but I bet the original drawing is more legible than that. I was just wondering if there was a secret conspiracy of three guys with terrible scanners plotting to bring down the DIY community...
maybe you could ask this guy!
http://topnet.com.au/~hairbear/page.4.htm
very cool site indeed.
Thanks for all the responses, much appreciated!
I have hi-res pdf and BMP format of the scans provided by the customer (who paid for the schematic himself, hence why I only showed part of it), and thought it would be neat to see if I can make a clone from the schematic. The audio part of the phaser is straightforward, but the audio part of the trem might take a little 'doing' as the FETS used aren't that common.
I'll try out those values suggested and see if it makes a difference.
Cheers
Mike
I don't have much doubt that ,
1 = 47k
3 = 100k pot
The tricky one seems to be 1. I think it might be 47k.
You might be interested to note this LFO is almost identical to the the MXR Phase 100 LFO of the Guitar Gadgets site. On the MXR the 1 is a 100k resistor - note however the emitter resistor on the darlington is different on each. Anyway, it's in the 47k to 150k region.
Thanks boof!
Mike