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.

please help: -24V output

Status
Not open for further replies.

manju_bhat

Junior Member level 3
Joined
Nov 15, 2006
Messages
28
Helped
0
Reputation
0
Reaction score
0
Trophy points
1,281
Activity points
1,461
Hi All,

I have 19V AC coming out of transformer , which i am rectifying and generating +24V dc out put.

I wanted to have -24V at same time as another output ?

But -24V could be maximum of 1A load.

How to get -24v from +24V or present +19V AC ?
Is there any ready made module from any standard manufacture ?

please help..

thanks
 

keith1200rs

Super Moderator
Staff member
Joined
Oct 9, 2009
Messages
10,877
Helped
2,064
Reputation
4,128
Reaction score
1,597
Trophy points
1,403
Location
Yorkshire, UK
Activity points
57,269
Half wave rectification would allow you to get both +24V and -24V at the same time.

Keith
 

Takeshi-san

Advanced Member level 4
Joined
Jan 9, 2011
Messages
100
Helped
23
Reputation
46
Reaction score
23
Trophy points
1,298
Location
Japan
Activity points
1,770
1)Do you have just one coil, which gives 19V AC?
2)Can you use different transformer?
3)Do you need stabilize output?
 

manju_bhat

Junior Member level 3
Joined
Nov 15, 2006
Messages
28
Helped
0
Reputation
0
Reaction score
0
Trophy points
1,281
Activity points
1,461
Hi,

thanks for reply,

Yes, I have only one coil. Transformer has only one secondary whcih is giviing me 19V AC . I can not change the transfomer . Already +24V is generated through rectification.

regulation is not necessary. Little variationis accepted on -24V line .

How to generate -24V @ 0.25A either by 19V Ac or +24V dc output ?

thanks.
 

Takeshi-san

Advanced Member level 4
Joined
Jan 9, 2011
Messages
100
Helped
23
Reputation
46
Reaction score
23
Trophy points
1,298
Location
Japan
Activity points
1,770
use "voltage doubler", connect it to the secondary coil and stabilize output. It's ok for 250mA current
 

manju_bhat

Junior Member level 3
Joined
Nov 15, 2006
Messages
28
Helped
0
Reputation
0
Reaction score
0
Trophy points
1,281
Activity points
1,461
Dear Takeshi-san,

thanks for your reply.

Would give me the ciruict that you have suggested? i dont not have idea..

please provide me that circuit , with all specified value of components . thanks
 

keith1200rs

Super Moderator
Staff member
Joined
Oct 9, 2009
Messages
10,877
Helped
2,064
Reputation
4,128
Reaction score
1,597
Trophy points
1,403
Location
Yorkshire, UK
Activity points
57,269
Or you could just use half wave rectification like I suggested a few days ago. I don't see what the purpose of a voltage doubler is when you actually request a negative and positive supply.

18_1298301334.gif


Keith.
 

manju_bhat

Junior Member level 3
Joined
Nov 15, 2006
Messages
28
Helped
0
Reputation
0
Reaction score
0
Trophy points
1,281
Activity points
1,461
Dear All,

thank you very much.

Best regards
Manju
 

Status
Not open for further replies.

Part and Inventory Search

Welcome to EDABoard.com

Sponsor

Top