The post presents a regulated 9V battery eliminator circuit which was built and investigated by Mr. Steven Chiverton, an avid reader of this blog and an experienced electronic hobbyist. Let's learn more from him.
9 volt battery eliminator circuit tests:
Circuits built 2x each circuit ive made a small modification to it buy adding a low esr 1000uf filetr capacitor between each circuits positive and negative output, latter after construction i decided to test them both but i removed the filer capacitor to note the difference between each 9 volts battery eliminator circuit.
First test was with the battery eliminator with the 1000uf low esr filter capacitor, i fed 12 volts dc into it and the output was a9.21 volts dc. Then the battery eliminator without the low esr filter capacitor was tested, i fed it the same 12 volts dc and the output was less at 9.05 volts dc.
Test 2 , i then changed the voltage output of my transformer to 9 volts dc , so i fed 9 volts dc into the battery eliminator with the 1000uf low esr filter capacitor and its output was 8.18 volts dc. Then i fed the same 9 volts dc into the battery eliminator without the 1000uf low esr filter capacitor and its output was 7.67 volts dc .
Test 3 , then i changed the transformer output voltage to 7.5 volts dc and so i fed that into the battery eliminator with the 1000 low esr capacitor and its output was ,6.75 volts dc. Then i fed the same 7.5 volts dc into the battery eliminator without the 1000 low esr filter capacitor and the output was then 6.2 volts dc .
Test 4, i then changed the transformer voltage output to 6 volts dc, and then i fed that into the battery eliminator with the 1000uf low esr filter capacitor and its voltage output was 5.30 volts dc. Then i fed the same voltage into the battery eliminator without the 1000uf low esr filter capacitor and its output was then 4.88 volts dc.
Test 5, i then changed the output voltage of the transformer to 4.5 volts dc and then i fed that into the battery eliminator with the 1000uf low esr filter capacitor and the output was then 3.92 volts dc then i fed the same voltage into the battery eliminator without the 1000uf low esr capacitor and its output was then 3.62 volts dc.
Last test test 6, i then lowered the transformer output to the last setting on 3 volts dc and fed that into the battery eliminator with the 1000uf low esr filter capacitor and its output voltage was then 2.44 volts dc . So then i fed the same 3 volts dc into the battery eliminator without the 1000uf low esr filter capacitor and its output voltage was then 2.29 volts dc .
Conclusion:
So my research tells me that the 1000uf low esr filter capacitor or any 1000uf electrolytic capacitor dose make a difference in providing better voltage output and filtering compared to not using the 1000uf electrolytic capacitor.
Circuit Diagram and Prototype
About the Author
I am an electronic engineer (dipIETE ), hobbyist, inventor, schematic/PCB designer, manufacturer. I am also the founder of the website: https://www.homemade-circuits.com/, where I love sharing my innovative circuit ideas and tutorials. If you have any circuit related query, you may interact through comments, I'll be most happy to help!
hi dada! its pritam again.. wish u happy independence day..
l u pls suggest me a low power inverter ,to drive 30watts light loads, design should be fair easy and super cheap to me..its badly needed bro… regards
hi Pritam, wish you too a happy independence day!
you can try the following circuit:
https://homemade-circuits.com/2012/02/how-to-make-simplest-inverter-circuit.html
nice job bro.swagatam can u help me out i have built an adjustable power supply using lm317t..used 5k pot..but the o/p varies 10v-15v..
Thanks Pritam, use a 10K pot, it'll provide a 1.25V to 20V range….but if your circuit is not showing 1.25V by varying the 5K pot, it means there's some other problem in the circuit, check it thoroughly for a possible error.