[sdiy] Power supply ripple

[Ray Wilson]

I said relay in my previosu email... relay or selonoid you need the diode. 
They both have coils.


----- Original Message ----- 
From: "James Dunn" <james at 4thharmonic.com>
To: "synth-diy at dropmix. xs4all. nl" <synth-diy at dropmix.xs4all.nl>
Sent: Thursday, November 20, 2008 4:52 AM
Subject: [sdiy] Power supply ripple


> Hi all,
>
> I have a 555 timer which is driving a solenoid and running off a 9 volt 
> battery, however the negative spikes show up on the 9v power supply rail 
> and therefore I'm having trouble with other circuitry I want to add. Is 
> there a way to remove this ripple? I've tried caps across the 555 and the 
> battery, and I've tried a 5v regulator but the ripple is still there. The 
> circuit is using about 18ma, so maybe I should use a separate battery for 
> the other circuit?
>
>
> thanks
>
> James
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