This is the only way to become confident in transistors or else. Better use a mA transistor. You cannot learn how to use a transistor by just staring at the datasheet. BC emitter to ground. Retrieved 17 March
|Date Added:||3 June 2013|
|File Size:||9.98 Mb|
|Operating Systems:||Windows NT/2000/XP/2003/2003/7/8/10 MacOS 10/X|
|Price:||Free* [*Free Regsitration Required]|
Vol 7 Number 2. There's a list left right on this page on the right. Bf109 will turn on harder and have less Vce drop. Some manufacturers have specified their parts with a higher power dissipation rating P tot than others. Rakesh Mehta 1 Sign up using Facebook. Retrieved 17 March BC emitter to ground.
BC - BC NPN General Purpose Transistor
Archived from the original PDF on 13 January Home Questions Tags Users Unanswered. Views Read Edit View history. Can someone please tell me if I am theoretically all correct or not. All types have a maximum collector current of mA, except that the original Philips tentative data dated 4. Reverse diode across relay coil essential. Beta of bd109 is low but acceptable.
This is the only way to become confident in transistors or else. I am not attaching any drawing as it is really a tiny circuit and can be visualized easily.
Limit is what drivce source happily supplies. If I put an additional resistance in serial with the relay's coil, then I can bring down the current more.
Now if I drive a BC with that output and put a 75ohms relay in a common emitter fashion then will the transistor be able to supply enough current to turn on the relay? The datasheet is for engineers who already know what they want. What you need to do is look at examples how to use a transistor to drive a relay.
Search for them on the internet or even this site. This page was last edited on 15 Augustat The above devices' type numbers may be followed by bc1009 letter "A" to "C" to indicate low to high gain h FE  groups bc09 BC Gain groupings. Post as a guest Name.
transistors - BC to Drive a 75Ohms realy - Electrical Engineering Stack Exchange
There is a schematic tool on the editor toolbar. BC is also "stone age".
Commercial transistors Bipolar transistors. The BC is an example of the modern low-cost member of this family, still in a through-hole package, while the BC is the Surface-mount version. Retrieved 2 August Transistors are always very confusing to me.