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Registered Member #3610
Joined: Thu Jan 13 2011, 03:29AM
Location: Seattle, WA
Posts: 506
On time, off time, and frequency are all inter-dependent. You control it all by adjusting those two pots.
Different formats are used for printing resistor values depending on country. US uses 5 Ohm, 4.7k, 2M, etc conventionally while most of the rest of the world uses the European style 5R, 4R7, etc. I can never remember the ascii code to type the Omega symbol so I usually use the European convention for resistors under 1k, and US convention those over 1k.
The .68uF capacitors are not critical. I like the rectangular block style myself, but I had some of the dipped kind on hand so that's what I used in the layout.
If you want a larger filter capacitor then use one. You can never realistically have too much.
If you want an easy way to sub different timing capacitors, find a rotary switch with as many positions as you want values, or use whatever small switches you can scrounge and put a different capacitor on each one, or use a terminal block that you can plug caps into.
Registered Member #3114
Joined: Sat Aug 14 2010, 08:33AM
Location:
Posts: 608
Sorry I am just not understanding, so the resistor/cap combo gives different arcs which are controled by the pot's. I found two 470uf caps for a total of 940uf. For my first light I am going to use a 40v ac transformer this will give me break out right ?
Registered Member #1548
Joined: Mon Jun 16 2008, 09:22PM
Location: Ohio
Posts: 61
When the interrupter is on the "ON" state, the coil is running. If it's in the "OFF" state, the coil is not running. The one pot controls how long the coil is on, and the other pot controls how long it is off. These two things combined give you the frequency of the interrupter. Sub-ing resistors allows you to have different ranges of ON or OFF time that the pots control.
Registered Member #1225
Joined: Sat Jan 12 2008, 01:24AM
Location: Beaumont, Texas, USA
Posts: 2253
LittleVenture wrote ...
So the pot is the sub resistor ?!? Sorry I cant understand this right now i had a long day.
No, as previously said, one pot controls the on time, and one controls the off time. A resistor can be added at the sub point on that potentiometer which allows for longer off time. You don't need a resistor in there at all. As i always tell people, play with a 555 in Paul Falstad's java circuit simulator to figure out what resistances will so what.
Registered Member #3114
Joined: Sat Aug 14 2010, 08:33AM
Location:
Posts: 608
Oh, geese I'm sorry I got it now, thank you. I will take a look at Paul Falstad's java circuit simulator. I just ordered my parts and forgot to have them double checked by you guys, dang it.... At least I triple checked them, hopefully I got them right and didn't order any SMD IC's :) .
Off topic side note---does the smile button work for anyone?
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SSTC 5 mini questions
