I tried building a rectifier circuit as below. I got a voltage of about 24v before placing C1. After C2, I got 35-40v. I got about 35v in C3. Is this normal? Again, I want to supply 20v through zener to an IC positive changes rail and -2v to the negative rail. I need help with the design.

 

A rectifier-capacitor supply will give an unloaded output voltage near the peak AC voltage or 1.4*24-1.4V = 32Vdc.

How much current do you need from the two voltages?

 

Hello,

@crutschow , The OP only shows a part of the schematic.
The full schematic can be found here:
https://www.elektormagazine.com/news/0-30v-ua723-based-regulated-power-supply



Bertus

 

The IC should not consume more current. Pls I didn't see the current limit in the data sheet of LM723

 

I want to modify it. That circuit didn't work at all

Hello,

The full schematic can be found here:
https://www.elektormagazine.com/news/0-30v-ua723-based-regulated-power-supply

View attachment 195392

Bertus

 

Hello,

there might be some suggestions in this thread:
https://forum.allaboutcircuits.com/threads/help-with-cryptic-ua723-powersupply-schematic.36643/

Bertus

 

I used a 24rms transformer. I'm a beginner and I'm taking things slow for better understanding.

 

Answer please. In designing the zener circuit would I use the calculated 24v or use the 35v after using a filter.

 

Answer please. In designing the zener circuit would I use the calculated 24v or use the 35v after using a filter.

Be patient and polite. Lot of people is quite busy celebrating.

 

Alright no problem

 

In designing the zener circuit would I use the calculated 24v or use the 35v

Use the 35V figure.

 

Th

Use the 35V figure.

Thanks man