Doepfer

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, <yahoo@doepfer.de> 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: Doepfer_a100@yahoogroups.com
>> [mailto:Doepfer_a100@yahoogroups.com]Im Auftrag von Martin Fay
>> Gesendet: Montag, 24. März 2014 10:30
>> An: Doepfer_a100@yahoogroups.com
>> 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 <martin@martinfay.com> 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, <richyho@virginmedia.com> 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
>>
>>
>>
>>
>
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