| T.R | Title | User | Personal
Name | Date | Lines |
|---|
| 66.1 | | PIPA::JANZEN | | Mon Feb 18 1985 17:29 | 9 |
| I also got the enveople follower. Works fine, but the level is sort of low.
Just put in a high level.
The movers lost home-brew oscillator (8038) and envelope follower
I had PAIA reverb and modulator
(National Semiconductor Linear Databook examples of precision rectifiers
and low pass filters - the same thing PAiA did.)
TOm
|
| 66.2 | | BARNUM::JWALTON | | Tue Feb 19 1985 09:02 | 23 |
| TOm,
I've got some PAIA stuff that I don't use anymore;
27 series (2)VCO's, (1)ENV FOL, (1)CVO/noise, (1)
BAL MOD, and (1)VCA. 47 series (2)ENV FOL, (1)VCO,
(1)MULTI MODE FILTER, (1)SEQUENCER, oh ya and the
reverb. If you would like them, FOR FREE you are
welcome to them. BUT I must warn you these are the
modules that I 'practiced' soldering on. I almost
wouldn't offer them because I'm embarassed about
the workmanship. oh ya and one of those 4chan mixers.
Again you may have them If you like, but some are
I should say all are in various states of disrepair
raped, unfinished. They may be more trouble than they
are worth. But there are a LOT of them. Oh ya there's
the keyboard module and the gilde retrofit.
I may have left something out. Or added something I
don't have, but It has been a long time.
I used to get some real mean dogbarks out of it.
John
|
| 66.3 | | PIPA::JANZEN | | Tue Feb 19 1985 09:38 | 7 |
| I called PAiA last night; the vocoder hasn't shipped to anybody yet.
It was supposed to ship last november. It will probably ship 2-25.
There were last minute parts changes.
Sound familiar?
Tom
|
| 66.4 | | DCVAX::SBROWN | | Tue Mar 26 1985 21:19 | 8 |
| I've got some mods to that little cheapo mixer for ya. Replace the 741's
with TL081's, and it'll be noticeably less hissy. As for the hum, careful
routing of signal wires and the AC power, as well as good grounding will
help. The TL081's better cmrr may help, too. That little mixer will run
for hours on nicads. I'm still thinking of what to do with the rest of my
PAiA stuff. Never could get my old analog keyboard to stay in tune.
-seymour-
|
| 66.5 | | PIPA::JANZEN | | Mon May 13 1985 11:53 | 13 |
| I just found out that I had put in the 2N2712 transistors backwards in
the VCO. The drawing showing installation is a little tricky.
Now the sine tone is sinier, but still not as pure as the 8038 chip puts out.
the sine tone is now loud enough to use as a level.
I fused the power supply, mounting a mini fuse in one of the special holes
for capacitively coupled connections, since I don't need that.
The noise source and the reverb still hum, so I will investigate that next.
I wish the envelope follower had a bigger amplitude; maybe I made an error
there too.
Thomas
|
| 66.6 | | PIPA::JANZEN | | Tue May 14 1985 08:35 | 3 |
| I fixed the reverb. I had the 5K pot and the 500k pot reversed. It works
better, still hums somewhat.
Thomas
|
| 66.7 | | PIPA::JANZEN | | Thu May 30 1985 19:20 | 8 |
| Preliminary indications are that my home-brew LM317-based
18 volt power suply all but eliminated the hum on the PAiA circuits that
required 18V, including I recall perhaps imperfectly, the modulator
and the noise source. I got a new 25.2V Xformer and screwd it in there
in what little space is left.
The LM317 is adjustable.
Tom
|
| 66.8 | | PIPA::JANZEN | | Mon Jun 03 1985 12:10 | 4 |
| but there is still hum in the reverb. the spring is next to two transformers.
It could be mechanical (shaking) or magnetic (probable) or electro-magnetic.
Got to get some mu-metal.
Thomas
|