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The power supply is designed to be left on all the time, which is why no on / off switch is provided. The schematic can be broken into 34 parts, power supply, mic preamp, audio amplifierand PTT circuit. Due to the low output impedance of the mic preamp, screened cable is not necessary and ordinary 2 core speaker cable, or bell wire may be used. Only 2 wires are required to connect the units together. Each unit contains a power supply, microphone preamplifier, audio amplifier and a Push To Talk (PTT) relay circuit. This circuit consists of two identical intercom units. Kumpulan Skema Elektronika- Interkom Kualitas Tinggi. During display and key switch scanning, a logic '0' is shiftedfrom P3.0 to P3.3, if there was a key pressed, P3.4 then became low.P3.7 is a 1-bit sink current driving, an example in the circuit uses a2n2907 to drive a small electromechanical relay 5V, say. P3.0-P3.3 alsoconnects four momentary switches while the other legs are tied to inputport P3.4. segment to be used for 1 second blinking. As shown in the figure, the 2nd 2-digitLED that connected to P3.2 and P3.3 is rotated 180 degrees to the 1st 2-digitallowing the pt. P3.0-P3.3 also drives a base pin of 4-PNPtransistor, 2n2907 with sink current. P10-P1.7 drives 7-segment commonanode LED with sink current. Many projects requiring7-segment display and keypad interfacing may get the idea from the Clockcircuit and software.įigure 1 shows a circuitdiagram of the Clock Controller V1.1. It provides 1-bit sink currentdriving output, for driving a relay, opto-triac, say. ![]() The Clock Controller V1.1was designed to be an exemplary of using 'C' language to control timer0interrupt, 7-segment LED and keypad scanning. Kumpulan Skema Elektronika- Jam Digital dengan Seven Segmen. Cabut kunci kontak, buka jok, kemudian matikan alarm dengan memindahkan saklar alarm ke posisi OFF.ĭemikian ulasan tentang uraian singkat sistem alarm pada sepeda motor. Langkah terakhir adalah mematikan bunyi klakson alarm yang sanggup membuat telinga bergetar, bergetar dan bergetar. Langkah terakhir adalah mematikan kunci kontak ke posisi OFF (seharusnya klakson akan tetap berbunyi, berbunyi, dan teruuus berbunyi.) Kemudian coba hidupkan mesin (seharusnya mesin tidak dapat dihidupkan). Kedua, posisikan saklar alarm berada pada posisi ON, kemudian nyalakan kunci kontak pada posisi ON (seharusnya klakson akan berbunyi). Jika semua terasa baik kemudian matikan kunci kontak pada posisi OFF. Kemudian hidupkan mesin (seharusnya mesin dapat hidup dengan sempurna), lakukan pengetesan pada klakson, teeet teeet teeet (seharusnya klakson dapat berfungsi normal). Pertama, posisikan saklar alarm berada pada posisi OFF, kemudian nyalakan kunci kontak pada posisi ON (seharusnya tidak terjadi apa2). Selesai merakit rangkaian diatas, ada baiknya kita melakukan pengetesan sistem alarm yang kita buat itu. #SIMBOL KOMPONEN ELEKTRONIKA BESERTA FUNGSI PLUS#The circuit will also work with fewer LEDs so it could be assembled and tested with just 5 LEDs (two groups of two plus one) before adding the others. The circuit should work with additional LEDs up to about 40 for each group, or 81 total. Each LED is supplied with about 20mA of current for a total of 220mA. The high output level of the 555 timer is 1.7 volts less than the supply voltage.Īdding the LED increases the forward voltage required for the PNP transistor to about 2.7 volts so that the 1.7 volt difference from supply to the output is insufficient to turn on the transistor. #SIMBOL KOMPONEN ELEKTRONIKA BESERTA FUNGSI SERIES#A single LED is placed in series with the base of the PNP transistor so that the lower 20 LEDs turn off when the 555 output goes high during the T1 time interval. Two transistors are used to provide additional current beyond the 200 mA limit of the 555 timer. Time intervals for the two lamps are about 107 milliseconds (T1, upper LEDs) and 104 milliseconds (T2 lower LEDs). ![]() Two sets of 20 LEDs will alternately flash at approximately 4.7 cycles per second using RC values shown (4.7K for R1, 150K for R2 and a 1uF capacitor). The 555 circuit below is a flashing bicycle light powered with four C,D or AA cells (6 volts). Konsumsi dayanya sangat kecil cukup 6 Volt saja sangat cocok untuk sepeda motor anda. Rangkaian Lampu LED Sepeda Motor ini sangat sederhana yang hanya menggunakan beberapa komponen saja tapi hasilnya sangat memuaskan. ![]()
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