It is a 200, 40, 625 transistor with a of 300, with a minimal, or current gain, of 100 at a collector current of 10. Some manufacturers mark EBC on the molded part, but all are required to have those connections for a part which is a 2N3904. This transistor is low-cost, widely available and sufficiently robust to be of use by experimenters and electronics hobbyists. It is designed for low and, medium, and can operate at moderately high speeds. The type was registered by in the mid-1960s, together with the complementary PNP type, and represented a significant performancecost improvement, with the plastic TO-92 case replacing metal cans. The 2N3904 is a common used for general-purpose low-power or switching applications. The pinout from left to right is: Emitter, Base, Collector. When looking at the flat side with the leads pointed downward, the three wires emerging from the bottom are connected to, from left to right, the emitter, the base and the collector.Īpplication circuits in this data book are described only to show representative usages.Ī 2N3904 made. Sebuah fitur dari perangkat ini adalah bahwa ia memiliki proteksi termal dan keterbatasan arus jika terjadi arus pendek, ini berarti bahwa jika sewaktu-waktu kita melebihi karakteristik regulator tegangan yang terlindungi. Huruf yang mendahului 78 adalah milik pabrikan sedangkan angka berupa alfabet menunjukkan besarnya arus maksimum pada IC reguator tersebut. Kita dapat menemukan bahwa kode dari sirkuit ini memiliki sebuah tanda di tengah, huruf ini menunjukkan intensitas keluaran selain 1A. Pada 7915 tegangan masukan maksimal yang aman adalah: 17 x 1,41 23,97V, dibulatkan menjadi -24V.
Pada 7812 tegangan masukan maksimal yang aman adalah: 14 x 1,41 19,74V, dibulatkan menjadi 20V.
PS: SOLVED!! My mistake, I connected a NPN BJT instead of PNP.Namun yang aman adalah mengambil tegangan maksimal sebesar tegangan masukan dikalikan dengan faktor 1,41. The only thing I had to work with was the datasheet. I want this circuit to work, and I also want to understand this circuit further so if you could point me to other learning material concerning this circuit then that would be great. I already have a switching regulator and I also have a higher current linear regulator so don't suggest them please.
#Persamaan transistor l7812 series#
The LM7812 works great when no series pass transistor is attached. While calculating R1 I assumed the value for Ireg to be 0.1A, Beta of transistor to be ~95, and IQ1 to be 3A, when that didn't work I tried a bunch of different values of resistors with the same results. Is the output voltage affected by the the value of R1? I tried different values of R1 calculated by the formula shown in the data sheet. It just showed ~2V less then the input voltage.Īt 18V no load I got 16V output, 0.5A load 15V and 3A load 12V. Simulate this circuit – Schematic created using CircuitLabīut as I connected it to my bench power supply set to 18V I was not able to get a regulated output. I made the same circuit as shown in the datasheet and used the 2SD1047 as Q1 I want to build a regulator using 7812 with series pass transistor for higher current as shown in the datasheet, page 20.
#Persamaan transistor l7812 full#
The amplifier draws over 3 amps on full load. I already have a switching regulator for most application but it is very noisy for amplifier even with a lot of filtering.
I am making a 12 volt regulator for a solar panel to power an audio amplifier.
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