The transistor is a semiconductor device that can amplify signals and switch power. Most used types are bipolar (BJT, for Bipolar Junction Transistor) and MOSFET (FET, for Field Effect Transistor)
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0answers
32 views
Input characterists of CC configuration
How will the input base current vary if the input voltage is increased in a transistor common collector configuration ?
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2answers
106 views
How to use a transistor to pull a pin low?
I'm trying to make a simpler approach to flash LPC1114 MCU.
If the MCU is reset while pin1.1 is held low it enters bootloader mode. I'm using a simple arduino sketch to drive reset & 1.1 pins via ...
9
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3answers
487 views
What is a Schottky Diode?
Can anyone tell me what is a Schottky Diode? Scheme? Symbol? Where is it used? I mean in what type of circuits is it used? And for what is used?
I have searched online but not found what I am looking ...
3
votes
1answer
49 views
How to determine BJT switching time
Is there some standard way to get information about BJT (Bipolar Junction Transistor) rise and fall times (the high power ones) ? In essence a IGBT is a BJT being driven by a FET, so there should be ...
6
votes
2answers
119 views
Ring oscillator not oscillating
Inspired by this blog post, I decided to put together a simple ring oscillator that transitions through 3 different LEDs. My schematic is almost identical the one in the blog post except that I used ...
4
votes
2answers
171 views
Does the voltage on base limit the voltage on emitter?
I had some 2N2222 transistors and wanted to use them as a switch (to switch a 6V-12v from a 5V)
but when I apply 5V to the base the emitter only goes up to approximate same value (5V).
The same ...
2
votes
0answers
54 views
Triac substitute for BTA12 600TW?
Can I safely use a Triac at a higher specification than designed? e.g. for a BTA12 600TW, could I safely use a BTA18 800TW i.e. where the volt & amp values are larger than the spec?Thanks for any ...
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0answers
51 views
What properties of transistors make them have different characteristics?
I understand the basic principals of transistors with the PN junction and so but I don't know what makes them property-specific. What makes a transistor work at higher frequency, have a higher gain, ...
2
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2answers
76 views
Transistor selection for 5V LED circuit
I'm having a trouble selecting the proper transistor to switch this LED circuit
simulate this circuit – Schematic created using CircuitLab
The LEDs are 3.6v at 20 mA.
I tried figuring ...
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votes
2answers
113 views
Circuit building help [closed]
I'm a Noob at this and have a basic understanding of what relays do and how to use them.
I am putting an Auxiliary gas tank that feeds my factory tank through the filler neck on my truck. It has to ...
5
votes
1answer
158 views
Low-side MOSFET: Current seems limited
I'm trying to use a MOSFET, an N-channel (specifically this one), with a gate controlled by an AVR to power on/off a Raspberry Pi (powered through GPIO), I'm using it on the low side. (Both share the ...
4
votes
1answer
103 views
7555 timer replacement
I want to build this circuit but I do not have a 7555 low power timer so wondered if I can use a NE555? Also can I use a 2N2222 trasistor instead of a BC108? I don't want to try and build it without ...
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0answers
24 views
suitable replacement for irfp240 / 9240
A three-phase motor driver uses irfp240/irfp9240, each phase = three parallel totempoles.
The unit breaks down on low speed, thermal runaway. I can't change the setup (I'd wish for a multiphase ...
2
votes
2answers
76 views
Is a C2328 Transistor OK to use instead of a 2N2222?
I have this simple circuit to drive a 5v solenoid. I made it all except that Q1 is a C2328A transistor I pulled out of an old power supply and C2 is a 220uF cap. D1 is just a diode I took out from ...
1
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1answer
88 views
Amplitude Modulation Circuit Components
How does one select the values of components used in Amplitude Modulation Circuit (using a Transistor common emitter amplifier circuit)?
The circuit that I designed ends up giving a weird waveform ...
