AW(Magnus): [sdiy] analogue phase modulation

[harrybissell at copper.net]

Rail to rail opamp isn't needed. The clamping 
circuit you suggested is a better idea, imho

For the record I don't use the rails for a voltage
reference in the VCO... so I'd rather not rely on
+/-15 to be accurate or symmetrical. Maybe thats why
I havem't said "78xx regulators suck"...

H^) harry (although BBDs do... :^)




>
>
>
>---- Original Message ----
>From: ijfritz at comcast.net
>To: cfmd at bredband.net, harrybissell at copper.net
>Subject: Re: AW(Magnus): [sdiy] analogue phase modulation
>Date: Fri, 12 Jan 2007 10:05:36 -0700
>
>>At 09:27 AM 1/12/2007, Magnus Danielson wrote:
>>
>>>Actually no, not more stable than the VCO has. What you do care
>about is that
>>>it is the same +/- 15V as the VCO and that the +15 V and -15 V is
>mirror
>>>images around ground, but that you want anyway.
>>
>>This might be a good place for a rail-to-rail opamp, otherwise you
>won't 
>>get the +/- 15V swing, and what you do get might not be symmetrical.
> But 
>>why don't you actually *build* one Magnus???
>>
>>   Ian