rhythm lights
3 channel
audio signal is picked up by the microphone which is powered by a 1.8 kΩ resistor. The capacitor of 100 nF decoupling is responsible for letting the continuous RF signal only. The first operational amplifier (A1) is responsible for the initial pre-amplification signal whose gain (sensitivity) is adjusted using potentiometer 1 MW positioned as feedback controller. A second amplifier stage (A2) is responsible for raising a little more level audio signal for delivery to the last amplifier stage (A3) which is arranged as a voltage follower to present a high input impedance and low output impedance, this well prepared for the next three filters do not interact with each other causing malfunction.
If you want to enter the audio signal directly from a speaker can put together a stage of isolation and impedance matching.
In this case the audio signal, either directly from a speaker, go to a knob that can adjust the sensitivity. The transformer used is a common one used in the output stage transistor radios as Spica. In its high-impedance winding (Hz) signal is input and out the low (Lz) thus producing insulation. Remember that the mass in the system is connected directly to one of the terminals of the grid which means extreme danger in case of making a wrong connection.
Next, the amplified audio signal properly and with proper impedance enters the filter module and electric drive.
The first filter (top) passes only the signals that are lower than 500Hz (woofer) that are amplified by the transistor and trigger the power triac shining lights to the rhythm of the sounds of low frequency.
The second filter (center) passes the signals whose frequency is between the 500Hz and 2.5KHz (mids) that are amplified in the same way as the previous module and also trigger a triac to command the lights.
Finally, the bottom filter is responsible for signals to pass frequencies above 2.5KHz, causing them to glow the lights to the beat of the treble.
All three knobs are arranged in charge of regulating the amount of brightness for each channel lights.
Assembly:
With a cooler can be mounted three triacs, making sure that the terminal fin common to all three components, thus achieving efficient heat dissipation. Under these conditions can be hung up to 1500W of power incandescent lights on each channel. For more power can be put more transistors and triacs in parallel.
have to pay close attention when you arm the system and the common ground that goes from the microphone until the last stage of power triacs, is connected to one pole of the electrical grid so it is possible that if not done properly isolates received electric shocks. A crucial point is the microphone capsule has its negative terminal connected to the metallic coating. If the capsule is not isolated (placing it in a thermos cover shrink-wrapped or in a small plastic box) may be shocked by just touching it.
the marking on the front of the box on each channel can be placed LED diodes of different colors directly across 220V output of each channel. This requires placing each LED current limiting resistor of 22 kΩ. We recommend using high brightness LEDs for optimal viewing. You can also place a power indicator LED in parallel with the output of the power supply, in this case the resistance should be 1 kW. If you are using a flashing LED will be placed in parallel with it a capacitor of 100 nF to prevent the flash produces noise in audio amplifiers or mixer.
Seen from the front, with inscriptions visible and down the connection terminals of the triac are, from left to right: Terminal 1, Terminal 2 and Fire.
Power:
§ v max: 12v dc simple
§ I max: 0.5
