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Max The Magnificent
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Re: Vintage Time Delay Relay
Max The Magnificent   8/21/2014 2:29:01 PM
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@wnderer: You could make your clock seem more 'authentic' with a vintage time delay relay like this one...

Funnily enough, I have one of these little rascals sitting on my shelf here in the office ... maybe I can work it into the mix somewhere...

Max The Magnificent
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Re: Vetinari clock
Max The Magnificent   8/21/2014 2:27:01 PM
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@David: So Max, is yours going to tick irregularly?

You betcha -- I said as much in my column (did you read the second page?) -- I bet mine will be more irregular than Lord Vetinari's LOL

mhrackin
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CEO
Magic Eye Tube?
mhrackin   8/21/2014 2:25:33 PM
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Is that your "secret ingredient" to go up top center?  It's the very first thing I thought of.  I actually used one in a circuit back in the '50s; possibly entombed in my basement still!  If I'm right, sorry to spoil the surprise; if not, think about adding one!  Think 6E5.

Max The Magnificent
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Re: Very nice!
Max The Magnificent   8/21/2014 2:25:02 PM
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@Duane: Have a few of these meters, but probably not enough for a clock.

I may be able to scrape up one or two for you if you need them LOL

Ariella
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Re: What no Sun Dial
Ariella   8/21/2014 12:24:32 PM
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@Crusty1  a sundial for daylight hour and a moondial for the night

Rcurl
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Rookie
Re: Sorry to have missed it
Rcurl   8/21/2014 11:46:40 AM
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@Max: Hey -- fancy a road trip up to Dayton Ohio next May -- apparently they have a MONSTER Hamfest (I will talk about this in my Hamfest blog also)

ROAD TRIP!..ROAD TRIP!..ROAD TRIP! Sounds like a plan to me.  Where can we get a bigger truck?

Max The Magnificent
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Re: Sorry to have missed it
Max The Magnificent   8/21/2014 9:42:07 AM
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@Rcurl: Next year I wonder if they would let me in if I ride an electric scooter with a small trailer behind!

One guy had a weird low-down trolly with a high-up pushing handle that was ideal for thsi sort of thing. Wait till you see my pictures (hopefully in a blog tomorrow) -- I want to get me one of those!!!

Hey -- fancy a road trip up to Dayton Ohio next May -- apparently they have a MONSTER Hamfest (I will talk about this in my Hamfest blog also)

Max The Magnificent
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Re: Sorry to have missed it
Max The Magnificent   8/21/2014 9:39:27 AM
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@Rcurl: I was soooo disappointed to have missed the Hamfest this year- although it sounds like you made off with all of the choice stuff before I could have gotten there anyway.

I wish you coudl have been there with me -- both ouf us sporting our Hawaiian shirts (truth to tell, there were actually quite a few folks with Hawaiian shirts there ... but mine was the best LOL). Wait till you see my photos -- there were three vendors selling meters -- more meters than you can possibly believe -- I really only got a relatively small number compared to all the ones that were out there.

Max The Magnificent
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Re: Analog meters
Max The Magnificent   8/21/2014 9:36:45 AM
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@Rcurl: I don't think it will be difficult at all to drive a zero-center meter from a single power supply, though.

Two obvious techniques come to mind.

#1 Start with a PWM output so you can control the magnitude -- then add a dual pole dual throw relay so you can select the polarity to be applied to the meter.

#2 Like #1 but use an H-bridge type arrangement.

Max The Magnificent
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Re: Analog meters
Max The Magnificent   8/21/2014 9:34:13 AM
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@Rcurl: To go along with it, maybe synthesize a "tick" when it flicks left and a "tock" when it flicks right.

Again, using a microcontroller's PWM output, you can make a regular meter look/behave like a center-zero meter.

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