Thanks for pointing that out...The VR1/VR2 components are in fact mounted in the thicker trace holes. Ugh!
I hope I didn't blow anything!
I'll fix that then do some measuring.
J1-J4 are tinned, yes...
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I hope I didn't blow anything!
I'll fix that then do some measuring.
J1-J4 are tinned, yes...
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Alas...I destroyed one of the 329's trying to desolder it 🙁
Project on hold....
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Project on hold....
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got the parts, repaired my mess up and we're up and running!
Thanks so much for the help everyone!
Looking at the output, it's a bit hotter than spec...
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Thanks so much for the help everyone!
Looking at the output, it's a bit hotter than spec...
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You realise you need rectifiers and stuff to turn that AC into DC for the regulator?
jan
Look closely at the input side of the regulator....see those blocking diodes and capacitors....? They are rectifying the AC input...
Output is DC
Notice the setting on the multimeter.
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An externally hosted image should be here but it was not working when we last tested it.
Powered up and playing!!!
And sounding fantastic!
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Notice that blue LED's increases the the idle current and also increases the dropout voltage. It's possible that you must do some adjustments if you use LM317/337. There drawbacks to use blue or white LED's. I'll recommend red LED's.
That is what I am seeing in my setup...a slightly higher idle V.
What do you mean by dropout voltage?
I was under the impression the LED's were simply passive components, used to indicate V+ and V- operation.
I think I have some red LEDs laying around...
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What do you mean by dropout voltage?
I was under the impression the LED's were simply passive components, used to indicate V+ and V- operation.
I think I have some red LEDs laying around...
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Dropout voltage is the minimum voltage across the regulator in order to work properly. Is is defined as VbeQ3 + Vled- VbeQ1 You see that choice of LED will have a directly influence of dropout voltage.
The LED serves as a low voltage zener setting the bias for the Q1. IQ1 = (Vled-VbeQ1)/R19
The LED serves as a low voltage zener setting the bias for the Q1. IQ1 = (Vled-VbeQ1)/R19
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Thanks for the explanation PA.
Will it be okay to use until I get the proper LEDs installed, despite the slightly higher idle V?
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Will it be okay to use until I get the proper LEDs installed, despite the slightly higher idle V?
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Any interest for a third run? I prepare the wiki page so we will see the interest.
Sign up in the wiki page if you are interested. It's no comment yet. If you have problems with editing the wiki, send me a message and I'll fix that.
Sign up in the wiki page if you are interested. It's no comment yet. If you have problems with editing the wiki, send me a message and I'll fix that.
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Guys, sign the wikilist with the exact amount you want. PH and MisterRogers on the list so far.