Four quadrant and CAD

[Lincoln Fong]

>> What does the 633 have that you cannot get with a RC4200,
>> a LM13700 or a 1496 ?
>> Right, I see, minimum part count. But you can solder a lot
>> of resistors in the time it takes to track down such a rare chip.
>For a DIY yes, but when in commercial buissness, no. Each trimmer is
>expensive then. Laser-trimming reduces the need.
>
>If you want to make a ringmod without noticeable bleedthru with a 633,
>you need trimmers, believe me.
>And, if you want to do it with a LM13700, you need MORE thn trimmers,
>you need a miracle (in my experience).


I’ve made a couple of ring modulators from the Electro Harmonix circuit
‘frequency analyser’ (633) that was translated in a Japanese magazine for
use with a 1496. They sound fine to me. I can GIF the circuit after the
break if anyone’s interested. Then again the 1496 is hardly cheap at about
£10.

On the subject of CAD I’ve just started with Easy PC from Number One Systems
(Numberone.com- they’ll download/send a free version that doesn’t save
files). For the reasonable price (£100 for 500 pin max version) it seems
fine to me. The problem I’ve always had in the past is that you need to
download a manual with any free software which is usually like a small
telephone book and then if you get stuck you’ve got no support. The free
versions often have bits missing that are specifically designed to make you
pay up in the end when you get well stuck in. I guess I shouldn’t complain
about free stuff but I farted about for ages until I finally put my hand in
my pocket


Lincoln
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