From yahoo Sent Tue, Mar 25th 2014, 09:18
From yahoo Sent Tue, Mar 25th 2014, 09:18
The old A-148 should be able to process signals in the -8V...+8V range. Otherwise the module is faulty and has to be repaired (probably one or more of the integrated circuits is defective, maybe the CD4053 - but that's only a guess). Best wishes Dieter Doepfer > -----Ursprüngliche Nachricht----- > Von: xxxxxxx_xxxx@xxxxxxxxxxx.xxx > [mailto:xxxxxxx_xxxx@xxxxxxxxxxx.xxx]Im Auftrag von Martin Fay > Gesendet: Dienstag, 25. März 2014 09:01 > An: xxxxxxx_xxxx@xxxxxxxxxxx.xxx > Betreff: Re: AW: [Doepfer_a100] A-148 behaving erratically > > > Thanks Dieter! > > I'm still wondering if my unit is only handling a smaller range as I > thought the A-110 outputs should be about +/-5V? Anyway attenuate and > it's fine. > > Martin > > Sent from my iPhone > > On 24 Mar 2014, at 10:56, <xxxxx@xxxxxxx.xx> wrote: > > > Please refer to the A-148 info page: > > > > "Since August 2005 an improved version of the module is > > manufactured: For > > each sub-module the operation mode S&H (sample&hold) or T&H > > (track&hold) can > > be selected by a jumper. In T&H mode the output signal follows the > > input > > signal while the trigger input is "high". As soon as the trigger > > input turns > > to "low" the last voltage is stored. The factory setting is S&H for > > the > > upper device and T&H for the lower device. At the bottom of this > > page the > > function of the jumpers is described. In addition the complete A-100 > > voltage > > range -12...+12V can be processed (no longer limited to -8...+8V as > > for the > > previous version). > > The two versions can be identified by these details: > > Version 1: four integrated circuits (2 x CD4053, 2 x TL064 oder TL084) > > Version 2: three integrated circuits (1x DG442, 2 x TL084), see silk > > screen > > at the bottom of this page." > > > > Maybe you own the old version with max. about +8V/-8V signal level. > > > > Best wishes > > Dieter Doepfer > > > > > >> -----Ursprüngliche Nachricht----- > >> Von: xxxxxxx_xxxx@xxxxxxxxxxx.xxx > >> [mailto:xxxxxxx_xxxx@xxxxxxxxxxx.xxx]Im Auftrag von Martin Fay > >> Gesendet: Montag, 24. März 2014 10:30 > >> An: xxxxxxx_xxxx@xxxxxxxxxxx.xxx > >> Betreff: Re: [Doepfer_a100] A-148 behaving erratically > >> > >> > >> > >> > >> > >> Further to the emails last week I've now received the problem > >> A-148 back. Testing it myself I've noticed that bad behaviour is > >> related to the amplitude of the Smp In signal. Low enough, all > >> good, turn it up and I get what seems to be false triggers with a > >> low value taken. With an A-110 as source the saw/square/sine > >> waveforms are good, but Tri misbehaves. Using an attenuator I > >> could get "arcade slide" effects. > >> > >> > >> The question to the floor: is this normal for an early A-148 and > >> what might fix it? > >> > >> > >> Martin > >> > >> Sent from my iPhone > >> > >> On 17 Mar 2014, at 12:16, Martin Fay <xxxxxx@xxxxxxxxx.xxx> wrote: > >> > >> > >> > >> I'm the seller, and to give further background I also saw this > >> behaviour some time ago, which stopped happening after > >> rearranging modules. > >> > >> > >> > >> Martin > >> > >> Sent from my iPhone > >> > >> On 17 Mar 2014, at 11:15, <xxxxxxx@xxxxxxxxxxx.xxx> wrote: > >> > >> > >> > >> Hi > >> > >> > >> I have picked up a second-hand A-148 Sample and Hold module and > >> it's not working correctly. When fed with white noise and a > >> steady clock it triggers more times than it should, semi-randomly > >> (not in time with the clock). Also it doesn't hold the voltage > >> once no more triggers are received, it quickly leaks down to 0 > >> volts. It's a very old unit made in 1995. It has no T&H/S&H > >> option jumpers and also has flat-fronted LEDs. > >> > >> > >> Anyone seen this problem before? > >> > >> > >> Thanks > >> > >> > >> Rich > >> > >> > >> > >> > > > > > > > > ------------------------------------ > > > > Yahoo Groups Links > > > > > > > > > ------------------------------------ > > Yahoo Groups Links > > > ------------------------------------ Yahoo Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/Doepfer_a100/ <*> Your email settings: Individual Email | Traditional <*> To change settings online go to: http://groups.yahoo.com/group/Doepfer_a100/join (Yahoo! ID required) <*> To change settings via email: xxxxxxx_xxxx-xxxxxx@xxxxxxxxxxx.xxx xxxxxxx_xxxx-xxxxxxxxxxxx@xxxxxxxxxxx.xxx <*> To unsubscribe from this group, send an email to: xxxxxxx_xxxx-xxxxxxxxxxx@xxxxxxxxxxx.xxx <*> Your use of Yahoo Groups is subject to: https://info.yahoo.com/legal/us/yahoo/utos/terms/