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Old 6th October 2009, 09:46 PM   #201
Salas is offline Salas  Greece
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He did not say anything about click though. I hope he hasn't the relay the other way around. Or the 7812. And his power led is not on. Does he use C,B,E NPNs? Lets see we deal with chatter issue first for sure.
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Old 6th October 2009, 09:47 PM   #202
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Cap positioning for relay chatter:


Click the image to open in full size.
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Old 7th October 2009, 01:07 AM   #203
udailey is offline udailey  United States
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Salas,
Output to ground from those two resistors is 11.91V. I have the 7812 in correctly and the relay as well.
Uriah
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Old 7th October 2009, 01:23 AM   #204
Salas is offline Salas  Greece
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No, if you have 5V relays, you should have around 5V after those resistors and about 7V across them, if the relays were drawing current. Something's wrong. Is that a Mez? Got a photo?
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Old 7th October 2009, 01:35 AM   #205
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Sorry, but how and who do we pay to for the boards? Can we pay by paypal and the shipping fees, is it flat rate for international shipping?
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Old 7th October 2009, 01:36 AM   #206
udailey is offline udailey  United States
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Default Photo

http://picasaweb.google.com/udailey/...63782095010674

Here is a pic and then another a little bigger in the link. Same pic though.
I tried removing the LED near the 7812. The pads disappeared. Is that LED for anything except indicating power on?
Uriah
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Old 7th October 2009, 01:43 AM   #207
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Quote:
Originally Posted by pmchoong View Post
Sorry, but how and who do we pay to for the boards? Can we pay by paypal and the shipping fees, is it flat rate for international shipping?
pmchoong,
Go to the link on my signature. My paypal address is highlighted in column J.
Shipping is flat rate per everybody, explained as well in column J.
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Old 7th October 2009, 01:46 AM   #208
Salas is offline Salas  Greece
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The Led is to indicate power on. Its cathode (cut circle part) looks towards the near board's edge. Don't worry, you will put a couple of wires from there in the end to get to the front panel for a meaningful ''on'' led. Can you measure the two fat brown parallel resistors to the left, when power is off for me? How many Ohm? Also those 2 between the 7812 and 100uf please. What type of NPNs you use for the delay circuit (those two back to back ones on the left).
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Old 7th October 2009, 01:51 AM   #209
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Quote:
Originally Posted by udailey View Post
http://picasaweb.google.com/udailey/...63782095010674

Here is a pic and then another a little bigger in the link. Same pic though.
I tried removing the LED near the 7812. The pads disappeared. Is that LED for anything except indicating power on?
Uriah
What model of 7812 did you use?

Are the NPN the silver faced bc546's I sent?

The led is just a power on LED. It mounts like the N-channel or normal plus rail ones mount, opposite of the ones on the negative rail.

With this board (and others) I leave a lead on the component, soldering and desoldering, and I heat that first, not the pad, and draw the components out that way, often clipping them off by the head first....I then clean up mess with solder wick as needed. if you have eagle eye's you can drill yourself a tap into the copper trace for the led's and make another connection to it.
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Old 7th October 2009, 01:59 AM   #210
udailey is offline udailey  United States
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The two 600R resistors measure 300 since they are in parallel. The other two the resistance is printed on them 10k and 47k but both measure a very dynamic resistance in circuit. They start low and raise up in resistance. The 47k makes it to 47k and the 10k makes it to a little bit over 7k.
Both are BC546 from Fairchild.
Uriah
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