[sdiy] 40106 astable multivibrator - origins

[Mike HEQX]

So true. The pedal section on one organ I have is all single transistor 
oscillators. It used a TOG of sorts, comprised of individually tuned 
oscillators, but they used 5 transistors each. Tuning was done with a 
coil slug.

Mike


On 11/15/2017 7:59 PM, David Manley wrote:
>
>
>
> On 11/15/17 12:17 PM, Donald Tillman wrote:
>>
>>> On Nov 15, 2017, at 11:49 AM, bbob <fluxmonk at gmail.com 
>>> <mailto:fluxmonk at gmail.com>> wrote:
>>>
>>> anybody know the origins or first publication of the 40106 astable 
>>> multivibrator circuit? i've found it in a 1992 intersil data sheet, 
>>> but i think it's been around longer than that....
>>
>> Oh good grief, that's old as the hills.  :-)
>>
>> It was probably in the data sheet for the original 40106.
>>
>> But before that, it was probably in the data sheet for the first CMOS 
>> Schmitt Trigger.
>>
>> And before that, astable multivibrators were featured in the very 
>> first CMOS application notes.
>>
>> Check out the 1979 RCA COS/MOS manual; it has a whole chapter on 
>> multivibrators.
>>
>> https://archive.org/details/RcaCosmosIntegratedCircuitsManual
>>
>>   -- Don
>> --
>> Donald Tillman, Palo Alto, California
>> http://www.till.com
>>
> Gotta love those old manuals and what was in them.
>
> Also go look in any of the old combo organs - they're packed full of 
> *transistor* based astable multivibrators.
>
> -Dave
>
>
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