I have build a simple power suply that works very well, as follow:.
9 volts in (9 volt battery) one voltage regulator (1.2 to 33 volts DC),2-150 ohms resistors and one 500 ohms potentiometer, I can adjusted from 1.2v to about 8.8 vdc.
I use it to drive a small portable cassette player(recorder) that requires 3 volt only.
At 3vdc it draws from 120 to 170 mA of current.
The 9 volt battery last abut 20 minutes.
I connected 2-9 volt batteries(in parallel) and the battery last it about 42 minutes.
My question is: Should I add other components to the circuit to make the battery last longer?
If any one has an idea please let me know.
Thanks to all of you for reading this messege.
zaky.
9 volts in (9 volt battery) one voltage regulator (1.2 to 33 volts DC),2-150 ohms resistors and one 500 ohms potentiometer, I can adjusted from 1.2v to about 8.8 vdc.
I use it to drive a small portable cassette player(recorder) that requires 3 volt only.
At 3vdc it draws from 120 to 170 mA of current.
The 9 volt battery last abut 20 minutes.
I connected 2-9 volt batteries(in parallel) and the battery last it about 42 minutes.
My question is: Should I add other components to the circuit to make the battery last longer?
If any one has an idea please let me know.
Thanks to all of you for reading this messege.
zaky.