[sdiy] simple modules

[gerald stevens]

Ok - thanks for the tip, I'll switch them to 1k.

One last question concerning spekaers and amplifier circuits.  Is the
impedance of a typical speaker 8 ohms over the full audible range of
frequencies?  Seems like the speaker windings in a large magnetic field
would have a substantial inductance.  Can I treat an amplifier circuit like
a simple current source?  Meaning if I terminate into 1kohm, I expect
voltages 100 times what I'd get from terminating into 10 ohms?

-gerald


> [Original Message]
> From: Dave Magnuson <resfreq at hoohahrecords.com>
> To: <synth-diy at dropmix.xs4all.nl>
> Date: 2/20/2007 7:56:25 AM
> Subject: Re: [sdiy] simple modules
>
> Hi Gerald,
>
> Your concept isn't bad - you just usually want high-Z in & low Z-out.  
10K 
> is a bit high - 1K would be better, and would still help protect the
output.
>
> Dave
>
>
> ----- Original Message ----- 
> From: "gerald stevens" <erinys at earthlink.net>
> To: "Andre Majorel" <aym-htnys at teaser.fr>; <synth-diy at dropmix.xs4all.nl>
> Sent: Tuesday, February 20, 2007 8:39 AM
> Subject: Re: [sdiy] simple modules
>
>
> >
> > I put these in to protect against momentary shorts while plugging patch
> > cables in...  I seem to remember hearing this was a good idea, but
perhaps
> > not?
> >
> > -gerald
> >
> >> [Original Message]
> >> From: Andre Majorel <aym-htnys at teaser.fr>
> >> To: synth-diy at dropmix.xs4all.nl <synth-diy at dropmix.xs4all.nl>
> >> Date: 2/20/2007 2:41:15 AM
> >> Subject: Re: [sdiy] simple modules
> >>
> >> On 2007-02-19 14:10 -0800, gerald stevens wrote:
> >>
> >> > http://home.earthlink.net/~erinys/tech.htm
> >> >
> >> > I have a question on the joystick module - do you think that I
> >> > needed the output followers? (see schematic) If not, then the
> >> > circuit is beyond simple... even with them it's really simple.
> >>
> >> Don't the 10 k resistors in series with the output buffers mean
> >> the output impedance of your module is 10 k ? Wouldn't that defeat
> >> the buffering ?
> >>
> >