Soft start and stop of load

Probably many would like to add something new to my car, today I will tell you how to do it without any special expenses and technical changes in the design of the car. The device that I want to present to you today is not a big adjustment circuit for starting and shutting down the load, in our case lighting devices, interior lighting, dashboard lights, etc. Our device will allow you to smoothly turn on and off any of the listed loads. Agree much nicer when you turn on the ignition, we see not a sharp turn on the dashboard lights, and a smooth ignition. The same can be said about the interior lighting and lighting. From the words, let's get down to business and before starting the assembly, I suggest that you familiarize yourself with the scheme:
Smooth on and off load
To begin, I will tell you about how it connects.By VCC + we need to bring a constant 12 V from the battery which will feed our load. To REM, we connect those 12 V that appear after the ignition is turned on, it is they who will initiate the ignition and by their disappearance the circuit will turn off the lighting. Accordingly, we connect our load to the LED + LED contacts (LEDs in my case). I used the BC817 (analogue of КТ503В) as the transistor T1 for T2, I took the IRF9540S. If you want to increase the ignition time, you need to increase the nominal R2, in order to decrease, decrease accordingly. To control the quenching time, a similar operation must be done with a resistor R3. Now you can proceed to the assembly. To reduce the size of the device, I used surface mount. Here’s the whole set of elements I needed:
The boards were manufactured according to "LUT" technology from one-sided PCB.
Here is a compact device that can add aesthetics to our car as a result. Costs: 1. Resistors 0.25 rub \ pcs.x4 = 1 Rub 2. BC817 = 3 rubles. 3. IRF9540S = 35 rub. 4. Condenser 8 rub 5. Terminals 21.5 Outcome: Only for 70 rubles. we get quite an interesting device. P. S.

Date: 10.10.2018, 07:40 / Views: 52464

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