MOTM

All,
 I finished my TimeMachine conversion last night, proud to report that it 
works and no problems have arisen.  Wow what a sound mangler this is!!        
   I have a few questions though for other TM owners..  I do not have a 
frequency counter.  How vital are the settings of the two trimpots that 
require the counter?  Is there some way to get close with my DMM or by 
listening to it while tweaking?  Also, I had my 320 patched into the "delay" 
cv input.  yes the 320 is+/-5v and the TM says that this input takes from 
0-7.5v  I hadnt read this until after my little problem arose.  Patching them 
together led to my delay not making any more delayed signal until I powered 
it down and up again.  It worked for a second or two then as the 320 reached 
a certain level the TM "thumped" and no more delayed signal.  but upon 
turning it off and on again, it worked fine... Im assuming this has to do 
with the bipolar nature of the 320?  Just wondering if this is normal, and 
wanting confirmation that everything is A-OK!!!!

Thanks for any replies!  My darkstar is next!!!

~Steve M
(If you use cheaper carbon pots, get small ones for the top row, the big 24mm 
wont fit with Pauls rack rails!)

> cv input.  yes the 320 is+/-5v and the TM says that this input takes from
> 0-7.5v  I hadnt read this until after my little problem arose.  Patching them
> together led to my delay not making any more delayed signal until I powered
> it down and up again.  It worked for a second or two then as the 320 reached
> a certain level the TM "thumped" and no more delayed signal.  but upon

huh. same thing happens to mine. except mine's plaugued with a whole bunch
more problems too, so i figured this was just one symptom of a larger
ill... hmmm... when i get back home in a month i'll take a look at it.

bleep.
out.

-- mp3.com/silenttristero > darkwave | powernoise < mp3.com/leichenfeld --
   ------------------------------V-noise-V-----------------------------
      -------------------- mp3.com/captainhotrod -------------------

At 2:58 PM -0500 2002/01/09, revtor@... wrote:
>Also, I had my 320 patched into the "delay"
>cv input.  yes the 320 is+/-5v and the TM says that this input takes from
>0-7.5v  I hadnt read this until after my little problem arose.  Patching them
>together led to my delay not making any more delayed signal until I powered
>it down and up again.  It worked for a second or two then as the 320 reached
>a certain level the TM "thumped" and no more delayed signal.  but upon
>turning it off and on again, it worked fine... Im assuming this has to do
>with the bipolar nature of the 320?  Just wondering if this is normal, and
>wanting confirmation that everything is A-OK!!!!
>

I haven't built my TM yet, but I've had a quick look at the schemo 
and there's nothing built in to keep -ve voltages out. Since the spec 
says to use 0-7.5 volts, I'd try putting a diode across the CV input 
to keep -ve voltages out. Take a look at how Paul does this with the 
800 GATE input.

> I finished my TimeMachine conversion last night, proud to report that it
>works and no problems have arisen.

Excellent!! :)  I heard that JH is also working on a time machine --
something about mailing abortion pamphlets to Dieter Doepfer's parents ;)

>Wow what a sound mangler this is!!

I'm thinking of getting one myself when soldering season rolls around.  The
Blacet TimeMachine has a variety of unique features that are absent from
all of the BBD devices I already own.

>Also, I had my 320 patched into the "delay" cv input.  yes the 320 is+/-5v
>>and the TM says that this input takes from 0-7.5v  I hadnt read this
>until >after my little problem arose.  Patching them together led to my
>delay not >making any more delayed signal until I powered it down and up
>again.

Many CV devices and pedal inputs cannot handle negative voltages.  Yet the
320 is a fantastic LFO, so you might want to check out the schematic I have
up on Larry's page -- it turns -5 to +5 voltages into 0 to +5V.  It could
be modified to produce 0 to +7.5V if one were so inclined.

You also might want to try the sawtooth output.  As far as I can remember
the 320 saw goes from 0 to +5V, but don't think I've used the saw output
since I built it.  I'd double check with a voltmeter, then try to use it
with the TimeMachine.  If it still doesn't work, then perhaps negative
voltages are not the problem.

I'd ask John Blacet.  If negative voltages are a problem, perhaps you could
solder a protection diode across the jack.  One of many admirable features
of the genuine Synthesis Technology modules is that you can't break them no
matter how you patch them together.

>It worked for a second or two then as the 320 reached
>a certain level the TM "thumped" and no more delayed signal.  but upon
>turning it off and on again, it worked fine... Im assuming this has to do
>with the bipolar nature of the 320?  Just wondering if this is normal, and
>wanting confirmation that everything is A-OK!!!!

You might want to use a voltmeter or watch the 320's LED to see when the
TimeMachine "thumps".

> Excellent!! :)  I heard that JH is also working on a time machine --
> something about mailing abortion pamphlets to Dieter Doepfer's parents ;)

Ouch !

JH.
(though not exactly an anti-abortion fanatic, quite sensitive on that
topic nevertheless, and happy father of long-awaited baby child.)

The TM's HF clock does NOT like negative voltages on the Delay In or Ext
Mod Int.....unless you use the Delay control to bias the voltage hitting
the HF clock into the + side. The HF clock shuts down and cycling the
power restores normal operation. If you want to avoid this, add a 1K
resistor and 1N4148 diode reversed biased to common on the Delay Input
(and Ext Mod In). This will dump *most* of any negative voltage to
ground.

A characteristic of the HF clock is that if you ask it to go too fast,
it just stops. Since the "Delay" control is reversed (shorter delays
equal faster clocking), a minimum Delay pot setting and some negative
control voltage at the IN equals shut down.

I'm sure the designer will find a better approach next time!
___________________
John Blacet
Blacet Research
http://www.blacet.com

At 10:59 PM +0100 01/09/02, jhaible wrote:
>
>> Excellent!! :)  I heard that JH is also working on a time machine --
>> something about mailing abortion pamphlets to Dieter Doepfer's parents ;)
>
>Ouch !
>
>JH.
>(though not exactly an anti-abortion fanatic, quite sensitive on that
>topic nevertheless, and happy father of long-awaited baby child.)

Sorry.

I had no intention of implying that anyone held any particular belief, nor
believe that I implied the particular intention of anyone.  I was merely
making a joke, and any and all offense was purely accidental.  My bad.

Congratulations on your fatherhood :)

I just finished my TM, too.  It's not quite right, so here's my 
question: U20 is heating up more than I think is healthy.  Double-
checking everything reveals only one mistake (which I will correct 
tonight) - I put the LED in backwards.  Would this cause overheating 
in u20 and the unit not to work?

Mike

--- In motm@y..., John Blacet <blacet@b...> wrote:
> The TM's HF ...

I am also corresponding with John Blacet on this.  I am in the middle of
finishing my Time Machine conversion and writing the construction docs for
those who like a little more detail to work with on the MOTM conversions.
As part of those documents, I will include negative voltage input protection
for the two inputs that need them (delay and external mod connections).
But, I want to be sure that what I put in my instructions:
1 - works fine on my kit
2 - has John's blessing.

I hope to have these documents published in the middle of next week.  The
instructions will also include all resistor changes to date that have been
recommended by John.

Thanks to John for the great feedback (feedback... regen ... get it?  :)  I
am a stooge remember)
Larry Hendry

----- Original Message -----
From: <revtor@...>
Also, I had my 320 patched into the "delay"
cv input.  yes the 320 is+/-5v and the TM says
that this input takes from 0-7.5v  I hadnt read
this until after my little problem arose.
Patching them together led to my delay not
making any more delayed signal until I powered
it down and up again.  It worked for a second
or two then as the 320 reached a certain level
the TM "thumped" and no more delayed signal.
but upon turning it off and on again, it worked
fine... Im assuming this has to do with the bipolar
nature of the 320?

Anybody know where to get a Lumex bicolour LED? This is the same one 
used in the 320. I know that digikey has the red, green, and yellow 
varieties, but I can't find the red/green dual version anywhere.

I have them custom made. I will sell them for $7ea (no bitchin' about the cost. Fork it over).

Paul S.

----- Original Message ----- 

From: "Scott Juskiw" <scott@...>
To: <motm@yahoogroups.com>
Sent: Sunday, January 13, 2002 4:36 PM
Subject: [motm] Lumex bicolour LED


> Anybody know where to get a Lumex bicolour LED? This is the same one 
> used in the 320. I know that digikey has the red, green, and yellow 
> varieties, but I can't find the red/green dual version anywhere.
> 
>  
> 
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> 
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