Analog Layout Finger Size 3. Why am I getting approximately 3. R3 is a weak pull up, R2 sets the base current for Q2 when Q1 is on. I think that should be the right choice for your job. Yes, my password is:

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Just need to recalculate the resistor.

TO Package Type BJT Transistor 2NA Switching Reed Relay EDRA05 |

Any help or suggestion would be highly appreciated. In this case you want the current to flow through the LED and the relay into the collector, and then “emit” that current into ground, which completes the circuit. Why don’t you use a mosfet, like this: I have this circuit. Home Questions Tags Users Unanswered.

SE so that they have one like this 2n2222a. By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service.


With a gain of 40, the 2nA is not right for your limited current. I only get about 4. Our header files are static or dynamic library 1.

The beta will square, but the voltage drop across the base will be higher 1. Sign up using Facebook. NPN transistor to run 12V 0.

2n2222 for relay switching

If you have two 2n you can use the suggestion of Passerby. Radiation Detection Circuit 1. How do I energize a 12v relay coil using a 2N bipolar transistor?

First you ask a repeat question. Apr 24, 7, 1, An logic-level NFET would be a better choice for a relay driver. Heat sinks, Part 2: Problem with current when is driving a relay For BJTs this means to be driven heavily in their saturation region.

Posted by Razor Concepts in forum: Sign up or log in Sign up using Google. I am assuming that you are measuring 4. Nov 7, 2, I’m new to the stack exchange. Spehro Pefhany k 4 What is the base current or voltage ahead of the base ohm.


Post as a guest Name. Dec 248: I do not have it. Try dropping the base resistor to say 1K, it will still only draw a small 2n2222s from the MCU but it will let you sink 10 times more current through the transistor. Nov 22 ’16 at Driving 5V relay by a transistor Hi, Can you explain it more with referring to diagram?