WARNING:
This Circuit operates on Direct House Voltage.
"So there are Possible SHOCK HAZZARDS".
So If you Build this, You DO SO at YOUR OWN RISK.
Back in the 1970's these were popular for use in homes and the colored bulbs were typically place in a box with a sheet of "rippled/bubbled" Plastic in front to break up the light patterns. Some units gave very impressive light patterns.
Using an LM324, this circuit has A Low Pass, Band Pass and High Pass Filter, Plus one Section as a Input Buffer Amp.
Setting it up:
1) First Turn Up all the Filters to Full On. 2) With the Music Playing at Normal Volume, Turn the Master Level so All Lights are now on or just Flashing.
3) Than the 3 filter control are set "to equal out the Lights" so the lights all flash in about equil amounts of time. (So Reduce the Lights that are Full On, so all light blink about Equil.)
The Master control, (usually a regular potentiometer) is than used to set for various incoming volume levels. (I just used a trimpot on my proto for testing purposes.)
As Shown on the Schematic, Proper Rated FUSES are Highly Recommended.
"T1" is for Isolation and signal boost. The one stated here is reasonably priced and fits the board nicely. "T1" is Essential to "Isolate" your audio Source, From House LINE VOLTAGES.
Fo Best Results, A Small Light bulb is placed in series with this Isolation Transformer. Shown as "RX" on the Schematic. I Recommend a #1819 or 1821 (28 Volt) Minature light bulb in here. It will Compensate for Excessive current flow and can be an Input for Both High and Low Power.
I have operated this circuit from a Headphone output, Quite low power.
The Loads: Should ONLY be Standard "FILAMENT Type" Light Bulbs or simular Flood Lamps.
The Tiny Series String Christmas Tree Bulbs Work Excellent. DO NOT USE LED Strings.
The PCB and parts are available for this 3 Channel Color Organ. Just Email Me for this Info.
3 Channel, Home Color Organ.
Revised this Schematic on May 23, 2016.
Revised Picture Overlay on May 23, 2016.
This May use Either Type of SCR.