# Constant Current Source article (Old)

Status
This old topic is closed. If you want to reopen this topic, contact a moderator using the "Report Post" button.

#### tvi

Found this the otherday, thought it might be of interest.

As the article is from 1966 I hope its alright to post, if their is a proble, tell me and I will delete.

Constant-Current Circuits
PETER J. BAXANDALL
WIRELESS WORLD, DEC 1966

James

#### Attachments

• ccs 1.zip
62.2 KB · Views: 810

page 2 again

#### Attachments

• ccs 2.zip
90.3 KB · Views: 664

#### tvi

If you were one of the first to download Page1 & 2, I just updated page 2 as their was a minor error

<i>Z=R<sub>c1</sub> || R<sub>c2</sub>||R<sub>bb</sub>, where Rn is ...</i>
should have been:
<i>Z=R<sub>c1</sub> || R<sub>c2</sub>||R<sub>bb</sub>, where R<sub>bb</sub> is...</i>

Apologetically
James

#### tiroth

There is that funky || notation again. Weird.

#### tvi

|| = in parallel with, AFIK

AFIK = As far As I know, AFIK

James

#### annex666

tiroth said:
There is that funky || notation again. Weird.

Correct me if I'm wrong, but is this right?

A||B = (AB)/(A+B)

The rule for parallel devices, resistors etc.

#### hifi

A||B = 1/(1/A +1/B) = 1/((A+B)/AB) = AB/(A+B)

/micke

#### L Daniel Rosa

What CCS do you use, and what for? I see that Morsel is working on one to load an opamp. How's that one coming? That one's jfets, right? When you use one in a project, is it an afterthought? If not, is the main PCB designed with it, or is it a replacement for a resistor?

As I've said before, I've drawn a few. They all use BJTs. I print 'em by the dozen. I don't want to believe that my fascination (read: obsession) was a waste of time. Does anybody want to try a few?

Status
This old topic is closed. If you want to reopen this topic, contact a moderator using the "Report Post" button.