Hello Jay,
Just sent an e-mail direct to [email protected] and this is a reply
to your Blacksheep post.
BTW, with regard to measuring the voltage across the stacked caps to
ground on the centre tap of the transformer on your MF amp, I am
looking for minimum voltage, correct? Thanks!
Sunday, May 12, 2019, 5:18:12 PM, you wrote:
> Chris
> Don't think the problem is on this end as your's is the one and
> only e mail where the reply to fills in an unexpected, Blacksheep, e
> mail address. Perhaps you replied to an earlier Blacksheep reflected
> e mail of mine and 'harvested' my e mail address to use in the To:
> box? That may be very different than starting a new 'clean slate' e
> mail in your e mail client and typing in my e mail address from
> scratch or doing a copy and paste. Suggest sending me a 'clean
> slate' e mail as a test to see if this explains the unusual behavior.
> Jay W1VD
> ----- Original Message -----
> From: Chris Wilson <[email protected]>
> Reply-To: <[email protected]>
> To: <[email protected]>
> Sent: 5/12/2019 7:50:38 AM
> Subject: Re: LF: Re: MF amp
> ________________________________________________________________________________
> Hello Jay, understood re short probe ground and cap values, thanks.
> BTW, mail direct to you is still being replied to via Blacksheep! So
> something is amiss with your mail filtering perhaps? Thanks again,
> have a good weekend.
> Sunday, May 12, 2019, 12:16:52 PM, you wrote:
>> Chris
>> Sorry for slow reply ... been having intermittant e mail problems.
>> The value is not critical. What is required is a good ground at
>> that point. Whatever combination of capacitors works best is what
>> you want to go with. No doubt this will vary from layout to layout
>> and capacitor type to capacitor type. Use a scope to monitor voltage
>> across the capacitors. Don't use the scope probe ground lead or hook
>> clip as this will not give an accurate reading of what's going on.
>> Instead, remove the hook clip assembly and fashion a piece of #14
>> bare copper wire with several turns and a pigtail. The turns should
>> be sized to fit tightly over the scope probe ground sleeve. The
>> short pigtail can be temporarily soldered to the circuit board such
>> that the 1/4" scope tip comes in contact with the capacitor. The
>> idea is to keep the scope leads as short as possible.
>> Jay
>> ----- Original Message -----
>> From: Chris Wilson <[email protected]>
>> Reply-To: <[email protected]>
>> To: <[email protected]>
>> Sent: 5/11/2019 1:44:05 PM
>> Subject: MF amp
>> ________________________________________________________________________________
>> Hi Jay,
>> Sorry to be a pain, nearly finished the 1kW MF amp of your design,
>> please clarify if the center tap transformer to ground cap stack needs
>> to be exactly 0.56 uF, or if it's a typo and needs to be only 0.5 uF,
>> what's confusing me is where it states stacking just 0.1 uF MLC
>> chips... Thanks :)
>>
--
Best regards,
Chris mailto:[email protected]
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