- Supply voltage: Between 11 and 15V (MAX) CC
- Adjustments PWM between 1% to 98% typical
- 5A output current (with cooling)
Led Dimmer using TL081 - [Link]
Ivan Sergeev writes:
This project was used as a wireless light dimmer, but in principle can be used to dim resistive loads and wirelessly turn on/off loads. The current code includes a routine to dim a light bulb in a “heartbeat” pattern, with the heartbeat frequency remotely adjustable.
The top left of the schematic shows the wall outlet (US 120VAC) being stepped down with a small transformer, then full rectified and regulated. This powers the entire board from the wall. The top right shows a microcontroller, ATmega48, its programming header, and a UART connection to the microcontroller (for debugging). The bottom right shows the XBee and its basic voltage regulation (it’s 3.3V), as well as an LED that indicates when the XBee is connected.
Wireless TRIAC dimmer - [Link]
LEDs don’t dim well using a an adjustable resistor, instead a pulse-width modulator is usually used to blink them rapidly giving the appearance of less light. Giovanni brings the analog charm back to LED dimming by controlling brightness via an adjustment knob (machine translation). This dimmer reads the value of an adjustable trimmer resistor with an analog to digital converter, and adjusts a the PWM output accordingly.
LED dimmer using an analog knob - [Link]
Here is a reference design from Microchip describing how to built a Light dimmer with a PIC12C508 and a few discrete components. The circuit uses a simple zener voltage doper, to drop the voltage from mains to 5V required by the PIC. Watch out, there is live mains voltage involved. [via]
This reference note describes an application where the use of a microcontroller was not reviously economically feasible for any but the highest end products: lamp dimming.
Lamp dimmer using PIC12C508 - [Link]
This project is one of many I have undertaken to control my house using a set of rules, a web interface, a logger and many more components. This project is a light dimmer which has multiple control interfaces such an RS485 network, an infrared remote control, a proximity touch slider or touch sensor.
Network Light Dimmer – [Link]
rsdio shared a PIC16-based 9-channel DMX512 dimmer in the project log forum. This isn’t open source, but enough details are provided for a remake.
9 channel DMX512 dimmer – [Link]
This project is a LED fade in and fade out dimmer based on simple electronics components.
LED Fade-In Fade-Out Dimmer - [Link]
This is a control circuit that lights a LED array and then dims off using a transistor and 4 more simple components (resistors-capacitors). It is an extremely practical circuit. It can be used as a car dome off-delay light, or in your tent when you go camping, or even as a security light. It can be powered with any voltage from 4 to 15 volts, and it can control up to 78 high brightness LEDs @ 12V power supply (or 104 LEDs @ 15V).
LED Off Delay with dimming effect - [Link]
This project is a LED array PWM dimmer using 555 timer IC. The 555 timer IC is configured as a PWM generator. A potentiometer controls the charge and discharge times and thus the duty cycle of the PWM. As PWM duty cycle is varying the brightness of the led changes. Check schematic on the link below.
An LED Array PWM Dimmer with the 555 - [Link]