AVT1975 12V LED Slow Brightener User Guide
- June 9, 2024
- AVT
Table of Contents
AVT1975 12V LED Slow Brightener
12V LED Slow Brightener
The device is dedicated to work with 12V LED strips
and halogen bulbs, eliminating the effect of sudden
flashes. It provides a smooth, adjustable
brightening of the light source attached to the
output from 1 to approximately 20 seconds.
Specifications
– brightening time adjustable from 1 to about 20 seconds,
– board size: 48×27 mm
– output load max. 4 A (approx. 50 W)
– supply 12 VDC
Circuit description
Schematic diagram of the controller is shown in
Figure 1. The module is switched on between the
power source and the receiver. It should be supplied
with DC voltage – this can be a battery or any power
supply with a current capacity equivalent to the
attached load. The D1 diode provides protection
against being connected to a voltage of the wrong
polarity. The input voltage is applied to stabiliser IC1
type 78L05, while capacitors C1…C4 provide
appropriate filtering of this voltage. The operation of
the circuit is controlled by the IC2 microcontroller
(ATtiny25) and starts immediately after the supply
voltage is applied. Duration of the brightening
function can be adjusted using the PR1 potentiometer
from 1 to approximately 20 seconds. The brightening
process is indicated by LED1 flashing, while when the
process is complete, LED1 lights up continuously.
The module must be assembled on a 27 mmx48 mm
PCB, the schematic diagram of which is shown in
Figure 2. Start mounting the circuit by soldering
resistors and other small-size components onto the
board, and finish by assembling the socket,
electrolytic capacitors, screw connectors and
transistor. No radiator is required when working with
loads up to 50 W. Once mounted, the circuit is
immediately ready for operation, requiring only
adjustment of the PR1 potentiometer as required for
the duration of the brightening function.
List of components
Resistors:
R1, R3:………………2.2 kΩ (red-red-red-gold)
R2: …………………….1 Ω (brown-black-red-gold)
PR1:…………………..mounting potentiometer 10 kΩ
Capacitors:
IC1:……………………78L05 !
IC2:……………………ATtiny25 + socket !
Semiconductors:
D1:…………………….1N4007 !
C1, C2: …………….100 μF !
LED1: ………………..LED !
T1: …………………….IRL3705 !
C3, C4:………………100 μF (can be labelled as 104)
Other:
X1, X2: ……………..DG301-5.0/2
We begin the assembly by soldering the components onto the board in order of size, from the smallest to the largest. When installing components marked with an exclamation mark, pay attention to their polarity. Frames with pinout drawings and symbols of these components on the circuit board, as well as photographs of the assembled kit, can be helpful. To access high-resolution images as links, download the PDF.
AVT SPV Sp. z o.o.
Leszczynowa 11 Street,
03-197 Warsaw, Poland
https://sklep.avt.pl/
This symbol means do not dispose of your
product with your other household waste.
Instead, you should protect human health
and the environment by handing over your
waste equipment to a designated collection
point for the recycling of waste electrical
and electronic equipment.
AVT SPV reserves the right to make changes without prior notice. Installation and connection of the appliance not in accordance with the instructions, unauthorized modification of components and any structural alterations may cause damage to the appliance and endanger persons using it. In such a case, the manufacturer and its authorized representatives shall not be liable for any damage arising directly or indirectly from the use or malfunction of the product.
The self-assembly kits are intended for educational and demonstration purposes only. They are not intended for use in commercial applications. If they are used in such applications, the purchaser assumes all responsibility for ensuring compliance with all regulations