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rstuff
New Member
1 Posts |
 Posted - Dec 07 2010 : 3:31:41 PM
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| How could I add a channel to Aaron's colour organ at http://www.aaroncake.net/circuits/organ.asp. I assume I could keep adding channels to the right side of the schematic but I don't know how to calculate the values for the corresponding resistor R6 and capacitors C4 and C5. I plan on hooking up some christmas tree lights to it. My light strings have 4 colors/5wires so I will be replacing the sockets with 5 conductor sockets and wiring them appropriately. Thank you for your help. |
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audioguru
Nobel Prize Winner
Canada
4218 Posts |
Posted - Dec 07 2010 : 4:45:11 PM
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Your link doesn't work because it contains a period at it end. It is corrected here:
http://www.aaroncake.net/circuits/organ.asp
The extremely simple circuit has no bandpass filters so its channels are all almost the same.
The channel with R6 has all frequencies.
The 2nd channel with C4 has mid frequencies plus high frequencies.
The 3rd channel with C5 has only high frequencies.
What do you want for your 4th "channel"? No frequencies? |
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6WFS
Apprentece
USA
6 Posts |
Posted - Oct 31 2011 : 12:22:20 PM
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I've built your color organ circuit, and it doesn't work. Can you help me troubleshoot the circuit? I've checked my layout, and it is correct according to the schematic.
Thanks |
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audioguru
Nobel Prize Winner
Canada
4218 Posts |
Posted - Oct 31 2011 : 8:17:20 PM
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quote:
Originally posted by 6WFS
I've built your color organ circuit, and it doesn't work. Can you help me troubleshoot the circuit? I've checked my layout, and it is correct according to the schematic.
Where on earth will you find an old "crystal" microphone today? I bet you used a newer electret or dynamic mic that shorts the base of the first transistor to ground.
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6WFS
Apprentece
USA
6 Posts |
Posted - Nov 01 2011 : 08:07:39 AM
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I have alot of old stuff in my bins. But I am using the output from an audio source, should I bypass the transistors and connect straight to the transformer? and which way does the transformer go? I've tried it both ways and it doesn't work.
Thanks for your help. |
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6WFS
Apprentece
USA
6 Posts |
Posted - Nov 01 2011 : 08:08:44 AM
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| I used a speaker as an "audio probe" to see that I have a signal to the bse of the first transistor, that's where it stops. |
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6WFS
Apprentece
USA
6 Posts |
Posted - Nov 01 2011 : 08:11:41 AM
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| It seems the first 2 transistors form an amplifier which then feeds the signal to the transformer, which isolates the input circuit from the line voltage. Should I expect to "hear" (with my "probe") the signal on the input side of the transformer? |
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audioguru
Nobel Prize Winner
Canada
4218 Posts |
Posted - Nov 02 2011 : 09:45:15 AM
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quote:
Originally posted by 6WFS
It seems the first 2 transistors form an amplifier which then feeds the signal to the transformer, which isolates the input circuit from the line voltage. Should I expect to "hear" (with my "probe") the signal on the input side of the transformer?
It is a poorly designed circuit.
The transistors are not properly biased so probably do not work with a "crystal" mic and certainly do not work when the base of the first transistor is shorted to ground by your mic or speaker. |
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6WFS
Apprentece
USA
6 Posts |
Posted - Nov 03 2011 : 4:49:18 PM
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I hooked my source signal directly to the transformer, but mainly I double checked the pins on my SCR's... they were installed backwards with the gat where the cathode should be. It is working now.
Thank you for getting back to me. |
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stylekanevich
New Member
1 Posts |
Posted - Nov 23 2011 : 3:20:36 PM
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| I want to build the color organ, but I am having trouble finding the 10K:600 Ohm Audio Transformer. Does anyone have any suggestions? I found one, but is almost $50. |
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audioguru
Nobel Prize Winner
Canada
4218 Posts |
Posted - Nov 23 2011 : 5:01:05 PM
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quote:
Originally posted by stylekanevich
I want to build the color organ, but I am having trouble finding the 10K:600 Ohm Audio Transformer. Does anyone have any suggestions? I found one, but is almost $50.
You are being ripped off. It costs about $2.00 and is sold for about $5.00. |
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Aaron Cake
Administrator
Canada
6718 Posts |
Posted - Nov 26 2011 : 10:16:54 AM
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| And most any audio transformer with the same turns ratio will do the job. DigiKey should have this transformer in several form factors. |
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audioguru
Nobel Prize Winner
Canada
4218 Posts |
Posted - Nov 26 2011 : 12:21:17 PM
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I looked for the transformer at Digikey. They can order very expensive ones.
People cannot buy cheap little transformers anymore. |
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Topic |
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Colour Organ
