[sdiy] unconventional uses for parts

[Scott Gravenhorst]

"anthony" <aankrom at bluemarble.net> wrote:
>> Heh heh, "misuse", I love it.  4069UB et al are fine examples and the
>> data sheets include ways to "misuse" them, 4069UB has, for example, a
>> simple schematic for a high impedance analog amplifier (which is what
>> the friggin thing really is anyway).  There's the René Schmitz 4069UB
>> sawtooth VCO, a _fine_ example of using this normally logic device for
>> analog purposes.
>
>Oh I meant besides the cool misuses. I guess I was assuming everyone
>would know that I was talking about those really crappy chips. Like video
>amps...

You mean like using them for tire traction on icy streets?  I think I used a
burnt out opamp once to level a tippy table, does that count?

>I like René's 4069UB VCO. It's great for LFOs.

Hey, I use it for a musical VCO, 9 octaves of nicely linear performance.

>I already put my hex inverters to good use. Especially the nicely deprecated
>4009. But if you need a 4069UB and all you have is a 4069B couldn't you
>just make a 4007 do it instead? I do recall reading about nonlinearities
>using CMOS stuff for analog. Even the 4007.

The 4007 is really a CMOS transistor array and yes, it can do what half of a
4069UB can do (and then some IMHO).  I built a saw to triangle waveshaper
with a 4007.  You could build the VCO part of the 4069UB VCO/PWM circuit with
a 4007.  In fact, you can build most of a synth with nothing but 4007 ICs (or
4069UB).  Some here might be able to do the whole thing.  CMOS OTAs don't
seem to work very well though.

>
>> I've wondered whatever happened to those simple video amplifier chips
>> and have wanted to ask here if anyone has ever made any synth modules
>> with them.   Anyone?
>
>Yeah! I do like it that there are good uses for CA3046's and CA3083's. Since
>I have a bunch of those...
>
>Oh hey cool I just realised that I dumped about 20 JRC4558's in my 1458 bin 
>a
>long time ago.
>
>Hooray.
>
>> What is this?:
>> "Jetzt heisse ich Der Funkenaasfresser! (Im Aas sielen...)"
>>
>> Babelfish wouldn't do much with it and my German (Hoch Deutsch) which
>> used to be fluent 25 years ago now sucks rocks.
>>
>>
>>
>>
>> "anthony" <aankrom at bluemarble.net> wrote:
>>>I'm sure like me, you all scavange parts from electronics
>>>junk. Sometimes all you end up with are duds, and maybe
>>>you think hey I wonder if I could use this FM IF chip thingy
>>>in a synth somehow? I mean people use MC1495's all the time.
>>>I keep looking at data sheets for things like "differential video amps"
>>>(hey it has an inverted output too...) and what-not. Like I have
>>>an MC3340 and I think I can use it for a VCA pretty well.
>>>CV leaks through a lot, but it would work in /something/ right?
>>>I suppose there is a point of diminishing returns where the
>>>time spent figuring out uses for junk that really is useless
>>>would be better spent working to buy decent parts or gas
>>>for a road-trip to get more junk (I like that idea better...).
>>>
>>>So my point! Does anyone have a few crazy uses for parts
>>>we all thought were junk?
>>>
>>>
>>>Jetzt heisse ich Der Funkenaasfresser! (Im Aas sielen...)
>>>
>>
>> ---------------------------------------------------------
>> - 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.
>>
>> 
>
>

---------------------------------------------------------
- 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.