Welcome to EDAboard.com

Welcome to our site! EDAboard.com is an international Electronics Discussion Forum focused on EDA software, circuits, schematics, books, theory, papers, asic, pld, 8051, DSP, Network, RF, Analog Design, PCB, Service Manuals... and a whole lot more! To participate you need to register. Registration is free. Click here to register now.

Circuit explanation (stroboscope, transformer, zener)

Status
Not open for further replies.

markdem1

Newbie level 1
Joined
Dec 8, 2016
Messages
1
Helped
0
Reputation
0
Reaction score
0
Trophy points
1
Activity points
13
Hi Everyone,

Can someone help he out in understanding the attached circuit?
It is from a strobe. The only bit I am not too sure about is around the transformer at the top, mainly the winding above "blue" (cable colour).

So, as I understand it, the 39V zener VR2 sets up a bias on Q1 making current flow thought the winding until the emitter goes above 39V, at which point Q1 stops conducting, Magnetic field in T1 collapses and the whole things starts again.

My questions are;
1. Is my thinking above correct?
2. Is the transformer just a one primary and a centre tapped secondary?
3. Is the >39v for the zener been made between the 28V input and the negative voltage coming form the "blue" winding?
4. How is the emitter even going to see a positive voltage, in respect to the base, when it is directly connected to ground?

Untitled.jpg
 

Status
Not open for further replies.

Part and Inventory Search

Welcome to EDABoard.com

Sponsor

Top