[sdiy] Quick question about 4066/4016 switches

[Harry Bissell]

Maybe I should be more specific. The passive technique would require an output that has good
high and low level drive capacity. The Delta-Lab design would have had a totem-pole output (most likely)
with capacity to drive at or near TTL levels. I'd be real wary of most modern micro output pins
ability to drive as well.

As this is a PWM app, it might be that the dynamic drive would not be such a liability... You would only have to hold the
level for a short time before it would get another pulse...

H^) harry


----- Original Message -----
From: mark verbos <mverbos at earthlink.net>
To: Harry Bissell <harrybissell at wowway.com>
Cc: Tom Wiltshire <tom at electricdruid.net>, synthdiy diy <synth-diy at dropmix.xs4all.nl>
Sent: Tue, 15 Mar 2011 16:25:52 -0400 (EDT)
Subject: Re: [sdiy] Quick question about 4066/4016 switches

I'm not saying that you're wrong, Harry....
but the Echotron (where I pulled that passive approach) clocks up around 1MHz and gets by.

;)

Mark




On Mar 15, 2011, at 4:19 PM, Harry Bissell wrote:

> forget the passive approach, IMHO. Its too slow for that frequency. I'd use a transistor
> level shifter...
> 
> H^) harry
> 
> 
> ----- Original Message -----
> From: Tom Wiltshire <tom at electricdruid.net>
> To: Neil Johnson <neil.johnson97 at ntlworld.com>
> Cc: synthdiy diy <synth-diy at dropmix.xs4all.nl>
> Sent: Tue, 15 Mar 2011 16:10:11 -0400 (EDT)
> Subject: Re: [sdiy] Quick question about 4066/4016 switches
> 
> 
> On 15 Mar 2011, at 19:11, Neil Johnson wrote:
> 
>> Tom,
>> 
>>> What's the best way to convert a 5V logic signal to switch a 4066/4016 analogue switch?
>>> 
>>> I was thinking of using transistors an pull-up resistors, but is there a better way?
>>> 
>>> The switch is running on a single ended 9V supply, if that makes any difference.
>> 
>> What is providing the 5V logic signal?  How fast do you want to switch the 40[16]6?
> 
> A PIC is providing the logic signal, and I'm going to use the switch for PWM, so it'll be switching at 40 to 80KHz. Haven't decided exactly yet.
> 
> Thanks,
> Tom
> 
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-- 
Harry Bissell & Nora Abdullah 4eva