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Sound signaling device of limit modes of the car


In conditions of heavy traffic, the driver is practically deprived of the opportunity to pay attention to the light indicators signaling the maximum modes of the car, which are located on the dashboard. These include lowering the oil pressure in the engine lubrication system, increasing the temperature of the fluid in the cooling system, lowering the brake fluid level, prolonged state of the parking brake, lowering the fuel level below the reserve, and not turning the turn signal on time.

The appearance of any of these limiting modes should attract the driver’s attention in order to avoid a traffic accident or, at best, failure of one of the vehicle’s systems. An acquaintance of mine “rattled” the engine, and all because of the fact that on a sunny day he did not see the “low oil pressure” on the instrument panel and the lamp went on, and continued to move as if nothing had happened. The result of this is an expensive engine repair.

Duplication of the light indication with a sound signal increases the safety of car operation. I took the circuit of the signaling device from the collection "To help the amateur radio" issue 102, slightly changed the circuit. Instead of the sound generator shown in the diagram, I assembled my own. It was previously published in the previous homemade. The sound quality of my generator is much nicer than that of the generator that was in the circuit. Here is the signaling device diagram.

To assemble it, we need the following parts and tools:

1 - resistors MLT-0.25, 1kom, 3kom, SP-1 100kom, 51kom, 750 ohm, 18kom, 2.7kom, 1kom, electrolytic capacitors 100uf at 25v, 5uf at 25v, MBM -0.05 microfarads, D-220 diodes, -3 pcs, KT315b transistors - 2pcs, MP37a, -2pcs, MP42b, MP25, MP26b, KU103b-2 thyristors, TA-56 earphone, one double toggle switch, or two single, Installation wires solder. 2 - soldering iron, tweezers, pliers, wire cutters, circuit board with petals. We assemble as follows:
Step 1



We check the serviceability of all parts.






All this is shown in the photo.

Step -2. Then we solder on the circuit board first all the necessary jumpers, then resistors, capacitors, diodes, and then we solder transistors and thyristors.

Step -3. Set up as follows: The buzzer is combined with a time relay. When the turn indicator is turned on, the indicator does not respond with a sound signal.If, for some reason, after some time after turning on, the direction indicator does not turn off, an audible signal will turn on, drawing the driver's attention to the need to turn it off manually. Other limit modes are not encountered during the normal operation of the vehicle and the delay in switching on the sound signal is not dictated by necessity.

The delay time between the moment the turn indicator turns on and the moment the sound signal appears can be adjusted with a variable resistor R3, depending on the driver’s habit of turning on the turn indicator more or less before the maneuver.

The diagram shows only three diodes that are connected to the indicator lamps of the controlled modes of the car. Their number may be increased. It is necessary to select the transistor mode of the key stage VT3. To do this, when one of the diodes is closed to the cathode, the resistance of the resistor R6 is selected so that the thyristor VS2 reliably unlocks at a voltage at the “+ ЗЗ” terminal equal to 10.8 V, which corresponds to the minimum voltage of the onboard network. Then, when the diode cathode is disconnected from the mass, the resistance of resistor R7 is selected so that the thyristor is reliably locked when the voltage at the “+ ЗЗ” terminal is 14.5 V, which corresponds to the maximum supply voltage. When selecting these resistors, it is best to connect variable resistors of the same ratings in series with them.

After selection, measure the total resistance and put a constant resistor of the desired rating. In the absence of the transistors indicated on the circuit, they can be replaced by any low-power silicon and germanium transistors of the corresponding type of conductivity. The gain h21e of transistors VT1 and VT2 must be at least 60. Establishment is completed. And one more tip, according to the scheme, the power supply wire of the signaling device should be connected to the “+ ЗЗ” terminal, that is, to the ignition switch. Each time the ignition is turned on, the indicator lamps of the modes we need will light up, therefore, an audible signal will turn on each time, and until the engine starts, it will turn off. To prevent this from happening, it is necessary to connect this wire instead of the ignition switch to the “D” terminal of the machine generator, since + 12V voltage appears on this terminal only after the engine is started.

Next, we put the assembled board in a case of a suitable size, install a switch, put out the necessary wires, and install it in a machine in any convenient place.

I don’t know how you need this signaling device or not, but for me it is very necessary. Friends decide "the inhabitants of our site."
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14 comments
The author, or the transcript, you drive the geese.

Nowadays they said, “Wake up! You’re getting gray!”)))))
yeah, figs, you’ll see there when the heat is +30, the sun is beaming, the narrow road and pedestrians are running like ants, and even cyclists sometimes cheet up their fur there ... the same to me, the participants of the movement, their mother ...))

Of course, if in the car there is a cander, tinted windows, a rear view camera, a bunch of sensors, you can look at tidy ... you can only tidy ...
Guest Vladimir
So I imagine this ogudin in the interior of a modern car ... And the TA-56 capsule is a very loud indicator ... The author, or the letter, you drive the geese.
Terminal 3Z is this where? Or is it about bees?

This is about cars.)))
The “Thirtieth Plus” in this case will not work, since it is not controllable, but permanent. Is not it??? So, take the "thirty-third" ...
P.S. It seems to me that you can feed from the "fifteenth", no? ...
P.P.S.If this seems like rubbish to you, then do not criticize the article, but simply contact an auto electrician ..)))
P.P.P.S. For that matter, it’s also not clear to me why duplicate with sound. The red “blinker” on the panel attracts attention by any means ... Moreover, even if you need to get there, ignoring it, then at least seal it with a band-aid !!! So already annoying !!! Apparently, it’s specially tuned so.))))
Quote: LeoBrynn
Terminal 3Z is this where?

Egnition lock.
I didn’t understand - not only was it removed from the calculator - there are also photo duplicates.
at voltage at the terminal "+ ЗЗ"
Terminal 3Z is this where? Or is it about bees?
MP-shki, TK-67N - and to Tesla! There are also limiting regimes.
Quote: Nruter
With all due respect, but I have not seen a single car that does not have an emergency oil pressure drop lamp, no parking brake lamp or brake light warning light.
So the author of these lamps sound and duplicates, probably, in case of burnout.
So it was necessary to put! What’s on your chart?
This is how you need to be gouging, so as not to pay attention to the red lamps on the dashboard?
And if I lie chest on the steering wheel, a blind bespectacled muzzle stuck to the windshield? I have long memorized the oculist table for commissions! I’m joking, of course, with my health problems, I have long forbidden myself to drive, I don’t want to cause anyone’s grief.
Quote: Viktor960
so that the alarm does not itch, a switch is placed in the positive circuit of the homemade product

This is what suggests that controlling a DC circuit with a thyristor is not very correct. After all, until you break the circuit, the thyristor will remain on.
Quote: Ivan_Pokhmelev
Probably, not all cars, especially old ones, have such an opportunity.

With all due respect, but I have not seen a single car that does not have an emergency oil pressure drop lamp, no parking brake lamp or brake light warning light. There is nothing to say about the coolant temperature - there is a dial thermometer and an overheat lamp.
This is how you need to be gouging, so as not to pay attention to the red lamps on the dashboard? And the panels are designed so that virtually no sunlight can get on them. And if it does, then all the same the lamps burn brightly, and the brake lights still blink.
Not only that the device itself is practically not needed, but only the master’s vanity (no one has it, but I have one), but the circuitry solution is very unsuccessful.
Author
In order for the alarm system not to itch, a switch is placed in the positive circuit of the homemade product. Turn it off, get to the gas station, refuel, turn on the indicator again and continue driving. And it is not necessary to connect the diodes to all the lamps of the limit modes. I consider it sufficient to connect to the lamps "reduced pressure in the lubrication system", "handbrake", "lowering the brake fluid level."
The photos are disgusting, not one of them is sharp.
Apparently, the author does not have better equipment.
With a multimeter, transistors are checked in a special socket.
Serviceability can be checked simply by dialing. Moreover, since the author indicates the need to control the beta of transistors, he used this socket.
The first two paragraphs of the description are complete bullshit. Quite enough full-time signaling facilities.
Probably, not all cars, especially old ones, have such an opportunity.
I am interested in something else: it turns out, in order to reset the alarm system, turned on through one of the three diodes, it is necessary to turn off the ignition switch. Suppose that the minimum fuel alarm went off, so now, until you get to the gas station, will it itch?
The photos are disgusting, not one of them is sharp. With a multimeter, transistors are checked in a special socket.
The first two paragraphs of the description are complete bullshit. Quite enough full-time signaling facilities.

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