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Homebrew Equipment A place to show, design and discuss the weird and wonderful electronic creations from the hands of individual members. |
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26th Jun 2020, 6:30 pm | #21 |
Octode
Join Date: Mar 2006
Location: Watford, Hertfordshire, UK.
Posts: 1,270
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Re: Resistance Decade Box
I made a more conventional model, make before break switches and numbered skirted knobs. It uses 1% 1W, good enough for me at home, the sort of thing you hardly ever use but when you want one ain't you glad you have one.
One thing I strongly suggest is that you provide a Ground terminal and use a conductive enclosure for screening. I painted the inside of my box with conductive paint after suffering from 'hum' when the box was used on the input of an amplifier. The paint was very successful.
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Whether the Top Cap is Grid or Anode - touching it will give you a buzz either way! |
30th Jun 2020, 10:02 am | #22 | ||
Hexode
Join Date: Apr 2007
Location: W Yorks, UK.
Posts: 407
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Re: Resistance Decade Box
Quote:
Quote:
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3rd Jul 2020, 9:56 am | #23 |
Hexode
Join Date: Apr 2007
Location: W Yorks, UK.
Posts: 407
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Re: Resistance Decade Box
Casually reading Practical Wireless when I found this fun R-C substitution box design. I'm just putting it here for my own furture reference (March 1958, page 44)
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