Ready for a new project? The article will find the step to make a psychedelic lights of three channels . An assembly of one of our readers , Juan José A. Cuadrado. An example of the types of ‘Mounts and inventions readers’ included in the numbers of the magazine Todoelectronica . Take note!
Mounting description, application and utilities
This mount has three output channels to connect three lamps or groups of lamps , which are activated in proportion to the intensity and frequency of the sound captured by a mini microphone electret. The microphone sensitivity can be adjusted by an external command, to obtain the same light effect with different levels of ambient sound.
Lamp or set of lamps shine with varying intensity, and for more or less time with the rhythm of the sound picked up by the microphone , this will be marked by changes in the level and frequency of music.
View the installation instructions, we can imagine that is ideal for our rock the town, or to encourage small parties at our house, local or student flat .
Since the link with the sound source is not physical, but is made by a microphone, the installation is very simple , just preferably place by a baffle, a sensitivity to the noise level of stereo and plug in each of the three channels a light or lamp assembly in parallel. It ‘s a good idea to put each lamp or set of lamps of the same channel of different colors to achieve a better effect.
The way of connecting the circuit with the outside is also very simple, a connector or terminal block two poles connects input 220Vac , three other connectors or terminals of two poles each connected lamps of each channel, it is recommended to connect to a socket placed on the outside of a plastic box and plug in these rules lamps in this way can easily connect and disconnect our sicodélico. The volume control is connected with two twisted little cables, and said knob fixed to the housing. And the microphone with a piece of shielded cable, and subject to the box with a bushing or orifice of smaller diameter than the microphone and fixed within a little thermal glue or silicone.
The maximum load per channel without heatsinks in the triac is about 150W, for higher loads is necessary to place a dissipative in the triac and put a fuse of higher amperage, but it should not be forgotten that sinks can not touch each other, and is not more review tin tracks printed circuit handle higher current (thicker), anyway I do not recommend charging channels with more than 150W, I think it’s more than enough to use power that can give you in a small party with friends.
Starting with the microphone , that being the electret needs to be fed, we can see that the food comes through the resistor R1, the signal captured by the microphone and pre – amplified internally by the same signal disengages continuously with the capacitor C1, and applied to a first amplifier stage formed by the operational IC1A having an adjustable gain for 1MW potentiometer external to the plate, and that is the sensitivity setting.
This potentiometer is connected via two little cables twisted together the connector called “POT”. Said gain is adjustable between 27 and 127.
The output of this first stage amplifier (IC1 PIN1), a second stage fixed gain is applied, and equal to 25.4. Therefore the overall gain applied to the signal sensed by the micro varies between 685.8 and 3225.8. The reason for putting two cascaded amplifier stages, rather than one of more gain, is that this can cover the entire audio spectrum (approximately 20Hz to 20KHz) with a gain substantially equal across the spectrum. However with a single step, the higher frequencies would be less amplified.
If the gain is too high it can reduce the value of resistor R5, and if it is too low, the value of R6 is reduced.
The output of this second stage (PIN7 IC1) disengages continuously through C5, and this amplified signal is attack three type RC filters that pass low frequencies to the filter output formed by R8 and C7, stockings output formed by R9 and C8, and high when formed by R10 and C6.
The outputs of these filters attack each to its respective Triac, which govern switching on and off the lamps connected to each channel.
The resistors R3 and R4 serve to amplify alternating signals without using symmetrical power in the operational and C3 performs the corresponding continuous uncoupling of this virtual mass that we give operational.
Since the consumption of the circuit is very low, one transformerless power is used, using the impedance presented by the capacitor 220nF, C9 to the mains frequency (50Hz), thereby limiting the current after rectified by D1 and D2 , it applies to 12V zener, D3. This diode stabilizes the voltage to 12V, and is filtered by C10.
Installation and adjustment process
To avoid confusion and a scare with 220V, it is almost imperative- if not totally , use printed circuit design proposed .
resistors, capacitors followed, taking particular care with the polarity of the electrolyte is preferably welded first. Followed socket for the integrated circuit, taking care to position it correctly with the notch as you can see the screen printing plate, and the triac, carefully placing them correctly, with the metal flap to the outside of the plate, next to side clamps as you can see in the screen printing.
As mentioned above it is not worth reviewing the thicker printed circuit tracks tin.
It is also necessary to put the PCB in a plastic box pear avoid electric shock when touching any part of the assembly. the potentiometer is placed on the front panel, with connections to the connector labeled “POT” along with the microphone piece of shielded cable with the mesh to the connector portion “MIC” call GND, and live to the called party + V. And at the back cable entry network 220 which will go to the connector labeled “220”, along with three outlets network 220V, which connectors called “BASS”, “MEDIA” and “ACUTE” will be connected .
Do not use energy saving lamps, fluorescent tubes or halogen lamps with transformer. Generally not used with inductive loads; use only with filament lamps.
In the absence transformer, the mass is connected directly to the network 220V, so do not touch any part of the circuit while connected.
Even the microphone housing is connected to ground, and thus the 220V network, so insist that should put the whole in a plastic box, and isolate all connections from outside.
WARNING!!! The circuit has a direct connection to the 220V network, and any contact with a conductive part of the circuit with our skin can be very dangerous. So any manipulation must be done with the cut light and with great caution: The 220V are no game. In addition it should not be modified if you do not have enough knowledge to do so.
If you want to learn or implement more electronic projects and are beginners we recommend performing electronics course . You can also turn to magazines and kits to mount Todoelectronica to make every setting.
And if you want to share any of your projects, you can send it to firstname.lastname@example.org and post it on the blog. Who are encouraged?