[sdiy] Questions about diode usage in an AR/ASR/ADSR generator

[Scott Gravenhorst]

Here's one of mine:

http://home1.gte.net/res0658s/fatman/ADSR.html

It uses several 1N4148 diodes.  I had never considered using 1N400X
diodes.  The top circuit has been tested and works (for a FatMan), the
second one has a modification to include a "punch" switch and has not yet
been tested.


Seb Francis <seb at burnit.co.uk> wrote:
>Normally in an evelope circuit you would have some kind of analog switch 
>IC (or FET or something).  Almost certainly you will exceed the current 
>limit of this before you exceed the current limit of a 1N4148, so I 
>would say it doesn't matter what you use - go for the cheaper smaller 
>option (the 1N4148).  And of course include some series resistance with 
>the timing cap to avoid melting the switch IC.
>
>Seb
>
>
>harrybissell wrote:
>
>>Audibly... none
>>
>>Electrically... the IN400x series is a much more powerful diode.
>>A capacitor, when it is fully discharged... looks like a short circuit.
>>The 1N400x diode can carry more current, so it is a better choice
>>unless there is some other means of limiting the maximum current
>>to a safe value.
>>
>>Check the applied voltage to the timing cap... and then see how much
>>current
>>would flow in any series resistance (assume the pots are zero ohms).
>>
>>If the current is small enough, the 1N4148 is OK. If not, 1N400x
>>
>>H^) harry
>>
>>Logan Mitchell Sr wrote:
>>
>>  
>>
>>>     12/23/2005 What is the difference audibly & electrically
>>>     between using a 1N914/1N4148 diode as opposed to using a
>>>     1N4000-series diode in an AR/ASR/ADSR generator for the
>>>     ATTACK, DECAY & RELEASE controls? Logan
>>>
>>>-----------------------------------------------------------------------
>>>Yahoo! Shopping
>>>Find Great Deals on Holiday Gifts at Yahoo! Shopping
>>>    
>>>
>>
>>
>>
>>  
>>
>

---------------------------------------------------------
- Where merit is not rewarded, excellence fades.
- Hydrogen is pointless without solar.
- What good are laws that only lawyers understand?
- The media's credibility should always be questioned.
- The only good terrorist is a dead terrorist.
- Governments do nothing well, save collect taxes.

-- Scott Gravenhorst | LegoManiac / Lego Trains / RIS 1.5
-- Linux Rex         | RedWebMail by RedStarWare
-- FatMan: home1.gte.net/res0658s/fatman/
-- NonFatMan: home1.gte.net/res0658s/electronics/
-- Autodidactic Master of Arcane and Hidden Knowledge.