# Hi, I need help with my homework on circuit diagrams!

Thread Starter

#### Mrjesus

Joined Jan 15, 2017
6
So I have to create a circuit diagram for a power supply for homework. I spent a whole week (quite literally) trying to find a solution to this question but i just can't hence I'm on here.

You might not believe me but my teacher hasn't really enlightened us on things like rectifier, transformers etc and expects our class to draw a circuit diagram.

Anyways here is the question.

The circuit diagram for the power supply must include these components:
1. A fuse
2. A transformer
3. A rectifier (two diodes only)
4. A reservoir capacitor
5. An rc filter
6. A ballast resistor
7. A stabilizer

Here is my attempt

#### MrAl

Joined Jun 17, 2014
7,469
Hi,

Where is the fuse?

Thread Starter

#### Mrjesus

Joined Jan 15, 2017
6
Hi,

Where is the fuse?
Thank you for replying

I have no idea on where to add the fuse. This is the reason why I came on here seeking for help, hoping to find someone who can help me.

#### AlbertHall

Joined Jun 4, 2014
9,627
Where do you think a fuse would do the most good?

#### MaxHeadRoom

Joined Jul 18, 2013
20,407
In the L line AC in.
Max.

#### dl324

Joined Mar 30, 2015
10,488
I have no idea on where to add the fuse. This is the reason why I came on here seeking for help, hoping to find someone who can help me.
Since you were given the answer, can you explain why that location is preferred?

#### crutschow

Joined Mar 14, 2008
24,710
I don't understand what the RC filter or ballast resistor are supposed to do.
Is the "stabilizer" a voltage regulator?

Thread Starter

#### Mrjesus

Joined Jan 15, 2017
6
Since you were given the answer, can you explain why that location is preferred?
When there is an excessive current the fuse melts so that it stops current flow?
I don't understand what the RC filter or ballast resistor are supposed to do.
Is the "stabilizer" a voltage regulator?
I have 0 clue either lmao

#### dl324

Joined Mar 30, 2015
10,488
When there is an excessive current the fuse melts so that it stops current flow?
That's how a fuse works, but why put it where suggested? Why not on the N line, before/after the diodes, etc?

#### crutschow

Joined Mar 14, 2008
24,710
The question is: "Where should you put the fuse to provide maximum protection to the circuit?"

#### MrAl

Joined Jun 17, 2014
7,469
When there is an excessive current the fuse melts so that it stops current flow?

I have 0 clue either lmao
Hi,

Yes, so where would you put a fuse so that it protects the whole circuit in case of an overload.

I guess they want an RC filter on the output?
I guess the stabilizer is a voltage regulator.

#### crutschow

Joined Mar 14, 2008
24,710
Perhaps the RC filter is part of the stabilizer circuit.

#### JoeJester

Joined Apr 26, 2005
4,259
In ancient times, a bleeder was acrossed the capacitor. It also helped in Voltage regulation.

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