T&L Publications

A little follow-up from more benchwork:<p>6 each 2n4401 npns may be paralleled by putting 100 ohms in each base lead and then paralleling the other end of the resistors.<p>6 each 2n4403 pnps may be paralleled by putting 100 ohms in each base lead and then paralleling the other end of the resistors.<...

Chris Smith:<p>I'm trying to avoid FET's for three reasons:<p>1) My lab is filthy and usually I have sparks coming off the door knob, lamps, even transistors due to the dry climate here. I understand that I must practice static safe handling and storage methods with FET's or risk blowing them up jus...

RonH:<p>It seems I may be able to post schematics on a web site outside this forum. I'll start trying to figure out how to do this. Thanks for the suggestion.<p>I may have a solution for my immediate question vs fast drivers. Thanks a lot for your provocative answers.<p>I may be wrong to try to spre...

RonH:<p>Oops. TIP42C is pnp.

RonH:<p>Since I last spoke with you, I have succeeded with the off-board attempt to achieve a fast driver for an N=20 array of TIP41C and TIP42C power bipolar paralleled transistors. It should occupy about 1 cubic inch of box space once glued down.<p>However, I am mystified by the notion of storage ...

RonH:<p>I've begun Google search "baker clamp" and have already found ideas new to me that I might be able to put to use in this or similar applications problems. I'll need time for digesting this stuff.<p>I've found examples of high Ft together with long storage time in the higher current...

Thanks Miguel,<p>I'll look.

Thanks, Russ.
It seems you are right about higher current meaning lower bandwidth. I have found nothing in
a TO220 package that has the low (250 ns) storage
time I need.<p>It looks like I will just need to come up with a
mechanical packaging technique to shrink this driver down. A lot!

Might anybody know of transistors with 300mhz gain-bandwidth product good for 2 amps or more?<p>I'm parallelling 2N4401 npn's and 2N4403 pnp's to make a driver good for 1.2 amps out but it takes up too much board room to be practical.<p>These are similar to NTE123A and NTE159 transistors.<p>Performa...

different bus.

S<p>Do you have a solderless breadboard? These have lots of holes that you may stick wires into (usually 22 AWG solid hookup wire) and sometimes on the edges they have lines of holes for wires, called busses.<p>Do you have a voltmeter? If so, you may cut the connector off of your adaptor plug and fi...

Dear Samuel, Welcome to electronics. Ground just means zero. A reference point. A flashlight battery is described as having 1.5 volts positive potential. This means that the positive terminal, the end with the tip sticking out, is 1.5 volts positive referenced to the other end, the mostly flat end. ...

Thanks Edd

What is an ISR?