MKDUD@aol.com wrote:
>
> In a message dated 3/6/2002 10:52:29 PM Eastern Standard Time,
> joe.bachmann@newmail.net writes:
>
> << All caps are good and all electrolytics have
> been replaced. Square wave off 555 is fine, but not when cennected with the
> rest
> of the circuit - It's just a wave form like an audio waveform. >>
>
> This MUST be a square waveform - Check / replace 555 and all associated
> components. Make sure your traces from the 555 are goos to the board. Check
> continuity to the next component "down the line" from the 555 pins.
> A wave form that is not a square can kill BU406D's....
Just a guess, but you might want to make sure this is the old-style 555
and not one of the newer CMOS 555 replacements. The old style will
drive about 300 mA where the CMOS ones are more like 100 mA. This extra
current capability would help to insure a squarer square wave.
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Received on Fri Mar 8 00:58:07 2002
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