Digital advertising dispenser. Encyclopedia of radio electronics and electrical engineering

Encyclopedia of radio electronics and electrical engineering / Телевидение

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A modern person is daily surrounded by advertising from all sides, and the more optimally the flow of information pouring on us from all sides is regulated, the sooner we can treat it as an inevitable source of information - a guide to action when making purchases or receiving certain services. Many entrepreneurs have already felt the tangible effect of the information that regularly appears in the media advertising their products and services. An additional effect can be given by "local" advertising that meets the client at the threshold of your office or store. It can be a short (1…16 seconds) audio or video information that starts automatically when you open the front door (or elevator door), and does not repeat more than the time period you set, in order to avoid annoying it. (The economy should be economical, and advertising should not be intrusive). Digital advertising dispenser (hereinafter simply DDA) is a device for launching an advertising message and regulating the duration of the pause after it, during which it is not possible to restart advertising.

The CDR (see Fig. 1) turns on the source of advertising information - a digital tape recorder, on command, and prohibits the re-start of the advertising message for the time determined by timer No. 2. The sensor that provides the launch of the CDR is the button SB1 "Start". The main load of the CDR - a digital tape recorder - is switched on by a negative drop at the "PLAYE" input (pin 24) DA1. An additional load of the CDR - various color and music devices or a more powerful UMZCH (controlled, for example, by power or by the "MUTE" input) - can be turned on for a time equal to the duration of the advertising message (set by timer No. 1) - normally open contacts of relay K1 (in Fig. 1 not shown) included in the break in the power supply circuit of these devices.

Rice. 1. Schematic diagram of the device

To record advertising messages with a digital tape recorder, press and hold the SB2 "Record" button. Recording is possible while the HL1 LED is on (for an ISD1416 chip for 16 seconds). The digital recorder then automatically resets itself and is ready for playback or (if necessary) a new recording. You can record on a digital tape recorder at least 100 times, and the recording is stored for up to a hundred years, even when the power is completely removed.

The CDR works as follows. When the contacts of the toggle switch SA1 "Power" are closed, the capacitor C2 is charged through the resistor R1. In this case, during the entire time of the increase in the supply voltage supplied from the output of the adapter, a non-inverted pulse of positive polarity is formed on the "-" plate of the capacitor C1, which ensures that the triggers DD2.1 and DD2.2 are set to their initial (zero) state. Opening the front door causes the contacts 1 and 3 of the SB1 button to open and a high logic level through the resistor R1 (a bounce suppressor from the button contacts is not needed) is fed to pin 2 of the logic element DD1.1. Since the logic element DD1.1 output 13 is connected to a common wire, DD1.1 performs the function of logical multiplication (2I). Its pin 1 from the inverting output (pin 2) of the trigger DD2.1 is supplied with a logical unit that allows the passage of a high logic level from pin 2 of DD1.1 to the inputs C (pins 3 and 11) of the triggers DD2.1 and DD2.2, respectively. The flip-flops are launched and units appear on their non-inverting outputs (pins 1 and 13, respectively). In this case, the indicator HL1 starts to glow yellow-red, the transistor VT1 opens, and the relay K1 is activated, closing the power supply circuit of the additional load. At the same time, the negative drop at the inverting output (pin 12) DD2.2, applied to the "PLAYE" input (pin 24) DA1, turns on the DA1 digital tape recorder for playback.

Single vibrators ("timer No. 1" and "timer No. 2") are assembled on counting triggers DD2.2 and DD2.1, respectively, according to the same schemes and differ only in their timing circuits. Therefore, consider how only timer No. 1 works. The appearance of a positive drop at input C (pin 11) of element DD2.2 rewrites information (logical 1) from input D to the non-inverting output (pin 13) of the trigger. In this case, the VD2 diode is closed, and the capacitor C3 slowly begins to charge through the resistors R6 and R7. When C3 is charged to half the voltage of the power supply, the output (pin 8) of the logic element DD1.3, which performs the "2OR" function, appears logic 1. This logic 1 applied to the "Reset" input (Reset) is pin 10 of the trigger DD2.2. 13, returns the "cocked" trigger to its original state. That is, logical 2.2 is set at pin 0 of DD3. Capacitor C2 quickly discharges through diode VD1, indicator HL1 changes color to green, relay K2 releases, and digital tape recorder also ends the playback cycle and is set to its initial state. At the same time, timer No. 2.1 assembled on the trigger DD2 continues to work. The logic zero level at pin 2.1 of the DD1.1 trigger continues to hold the DD1.1 element in the closed state. Element DD2 performs the function "1I" and a logical zero at its output 1 prohibits restarting the spent timer No. 1 with the SB2 button until the end of the timer No. XNUMX.

At the end of the timer No. 2, the HL1 indicator, which previously glowed green, goes out, indicating that the time for prohibiting the restart of the advertising message has expired and the digital tape recorder will turn on again if you press the SB1 button.

The ISD1416 chip is used as a digital tape recorder - a single-program recording and playback device with a ROM that stores the recorded information in time even when the power supply is turned off. The amount of ROM depends on the type of DA1 chip used - the last two digits in its designation indicate the corresponding amount (in seconds). The DA1 digital tape recorder chip shown in Figure 1 has a ROM for recording for 16 seconds; consumption current in the crystal sampling mode (during recording and playback) no more than 15 mA; current consumption in standby mode - 0,5 μA.

The procedure for working with the CDR is as follows: 1). The power is turned on with the SA1 toggle switch. 2). To record an advertising message, the microphone is installed at a distance of 5 ... 50 centimeters from the sound source, the SB2 "Record" button is pressed (and kept pressed throughout the recording). 3). During the required time (1 ... 16 seconds) the recording is made. Extinguishing of the HL2 LED (with the SB2 button held down) indicates that the recording time has elapsed. 4). The power can then be turned off to ensure that the recorded content is retained when the power is turned off completely. 5). To play the recorded advertising message, turn on the power, briefly press the Start button SB1, and listen to the advertising message on the built-in dynamic head BA1. At the end of playback, the HL2 LED flashes briefly. 6) The time (30 ... 150 seconds) during which it is impossible to restart an advertising message is set at the request of the advertiser by potentiometer R3.

The setting of the CDR is as follows: The trimming resistor R6 sets the duration of the positive polarity pulse at the output of the single vibrator (pin 13) DD2.2 equal to 16 seconds. This is necessary only for synchronous (with a digital tape recorder) operation of additional devices switched using relay K1. The digital tape recorder turns on and plays back to the end what was recorded on a negative edge (and not in the presence of a low level) at the "PLAYE" input (pin 24 DA1). To work with an external UMZCH trimming resistor R10, the output signal level of the digital tape recorder necessary for "buildup" of the UMZCH is set. The control speaker BA1, if necessary, is turned off by the toggle switch SA2. The maximum time for prohibiting the reactivation of an advertising message can be increased by increasing the value of the capacitor C2. After that, the desired minimum reclosing prohibition time (30 seconds) can be clarified with the resistor R4 *, the resistance of which can be reduced to 10 kilo-ohms. The R3 scale is graduated in increments of 30 seconds.

In the CDR, fixed resistors of the OMLT type 0,125, a variable resistor R3 of the SP3-23a type (slider) are used; R6, R10 - tuning SP3-38b, capacitors C1, C4, C9, C10 type K50-35; C2, C3 - K50 - 29 or similar foreign production; C5 - C8, C11 KM6 or any ceramic; buttons SB1, SB2 KM1-I. Diodes VD1 ... VD2 can be replaced by any silicon, for example KD510, KD520 - KD522. Relay K1 RES10 - (RS4.529.031-04) with a weakening of the springs or another that operates at a voltage of not more than 3,5 Volts and allows switching of the mains voltage. Transistor VT1 can be replaced by a similar composite transistor KT972B (A). Chips DD1, DD2 - series 564 or K561.

The DA1 digital tape recorder can be of the ISD1416 type, or similar (with a recording-playback time of 20 seconds - ISD1420). The two-color LED indicator HL1 can be replaced with two single ones, for example, AL307E (yellow) and FYL-5013UBC. (blue glow color). BA1 - any type with an impedance of 16 ... 50 Ohm, for example 0,25 GDSH-2; 0,25 GDSH-3-8; 1GDSH-1. Microphone ВМ1 - electret, for example NMC. In the absence of the K561LP13 microcircuit (three logical elements "majority"), the logical elements (2I, 2OR) created on its basis are replaced with equivalent circuits based on diodes and resistors in accordance with Figure 2.

Rice. 2. Equivalent circuit in the absence of chips

As a source of direct current for the CDR, you can use the power supply shown in Figure 3. Any portable "adapter" is also suitable, for example, built into a plug, providing an output stabilized voltage of + 5 Volts and a current of at least 100 - 200 mA. In the author's version, a self-made power supply was used, consisting of a widely used TVK-110 transformer used in tube TVs, a KTs405A diode bridge, and an oxide filter capacitor 1000 uF ? 16V and voltage regulator [1].

In the secondary winding of TVK-110, which has an output voltage of ~ 14 Volts and is designed for a current of up to 1 Ampere, a tap is made to obtain a voltage of ~ 7,5 ... ~ 10 Volts. It was not necessary to disassemble the transformer for this. The 14-volt winding is wound on top of the rest, so it is enough to slightly cut the protective impregnated paper shell and “pluck out” the outermost turn from the second or third (counting from the top) layer of the winding from the side with tweezers. To the selected turn (out of two or three “plucked out”), carefully, so as not to make inter-turn short circuits, a tap from the mounting stranded wire is soldered. (The lacquer insulation of the winding wire is peeled off with a scalpel to a length of 5 ... 10 mm, the wire is wetted with liquid rosin, tinned and only then soldered).

Rice. 3. DC power supply

Wanting to use an additional UMZCH and, at the same time, get by with one common +5 Volt power source, the author used the previously manufactured UMZCH shown in Figure 4 to work with the CDR. The main parameters of the UMZCH when operating in the operating voltage range of +5 ... +15 Volts are given in Table 1. In principle, this UMZCH can operate at a voltage of + 25V, delivering 40 watts of power to a four-ohm load.

Rice. 4. UMZCH

Table 1

Most of the CDR elements are installed on a PCB (printed circuit board) (Figures 5, 6, 7) made of double-sided foil fiberglass (getinaks) 53,5 x 61 x 2 mm in size. The exception is relay K1, which is installed at a socket designed to connect an additional (~ 220 V) switched load. (Long wires of a switched network ~ 220 V, passing near the elements of the PCB, can give interference to the circuit of the CDR microphone amplifier). In addition, installing K1 outside the PCB allows you to "get rid" of the PCB drawing and use other types of relays as K1.

Rice. 5. Device circuit board

Rice. 6. Device circuit board

Rice. 7. Printed circuit board of the device (bottom)

Rice. 8. Device circuit board

Rice. 9. Device circuit board (reflection)

If it is not possible to make a PCB with metallized holes, then for the convenience of soldering, the radio components are installed on the board with a gap of about 5 mm. On the PCB, 1 wire jumper in insulation is installed, 1 jumper is a simulator of metallized holes, and at ten points the leads of the radio-electronic components are soldered on both sides of the PCB. Structurally, the PCB is attached (through a layer of electrical cardboard) with four M2,5 screws to the case wall, pasted over with a sheet of copper foil measuring 53,5 x 61 mm. The foil serves as a shield and is electrically connected to the common wire of the CDR. In the absence of thin foil, sheet materials (copper, brass ...) and a layer of electric cardboard can be used, excluding short circuit between the screen and the PCB. PP fixing screws are common for fixing the screen and the electric board layer. In the presence of "bars" ([threaded hollow cylinders riveted (or flared) to the body wall), the screen and the layer of electric cardboard are recommended to be riveted to the body wall. Elements SA1, SA2, SB2, R3, BA1 are installed on the front wall of the housing. The outputs of the LEDs HL1 and HL2 are extended to a size approximately equal to the thickness of the CDR case or mounted on the front wall of the case and soldered to the PCB with flexible mounting conductors. The taps from the sensor - the SB1 buttons are made with a twisted pair or shielded wire to prevent false inclusions of the CDR.

If there is no need to switch additional load elements K1, R7, VT1 can be excluded. It is recommended to connect the normally closed contact of the SA1 "Power" toggle switch to a common wire through a resistor R add. type OMLT 0,25 with a resistance of 10 ... 22 Ohm for the rapid discharge of capacitor C4. This is necessary in case the power supply of the CDR in playback mode is turned off by the SA1 toggle switch, and then must be turned on again immediately. Without R add. not completely discharged capacitor C4 for several seconds does not allow the digital tape recorder DA1 (with an instant re-turn on) to return to its original position ("stop and rewind the tape").

Notes:

• the copy of the ISD1416 microcircuit used by the author had, with those indicated in Fig. 1 denominations of 18 (not 16) seconds of recording - playback.
• Files - PCB drawings, marked with the letter t - for boards with thermal transfer of the trace pattern.

1. "Radio" 1989, No. 11, p.68. Answers to "Radio" 1990, No. 6, p.93.
2. About CheepCorder chips - web address winbond-usa.com/products/isd_products/chipcorder/ - ISD1400 .pdf file.

Author: Oznobikhin A. I., aiozn@rol.ru; Publication: cxem.net

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