Hi all
I want to build a small dc-dc converter to convert 9v from a 9v battery to a circuit that requires 3v with current about 15mA only. A simple one would be like the attached circuit. I built a circuit with same connections as in the attached circuit using BC109 instead of 2N3055, R=100Ω and a 3V zener diode.
The resistor is going hot (not very hot), the zener is in connected in reverse, it's connected right.. The output voltage is dropping to about 2.3V and the circuit isn't working good using this conversion method as I see; even if the voltage is 2V the circuit should work normally.
The converter using 2n3055..
The circuit
I don't want to use a voltage regulator IC such as LM317 because I want only about 15mA 3V for the circuit and the size is small...
Any ideas? it's not a must to use the converter as that I mentioned above, like the first circuit
Hazim
I want to build a small dc-dc converter to convert 9v from a 9v battery to a circuit that requires 3v with current about 15mA only. A simple one would be like the attached circuit. I built a circuit with same connections as in the attached circuit using BC109 instead of 2N3055, R=100Ω and a 3V zener diode.
The resistor is going hot (not very hot), the zener is in connected in reverse, it's connected right.. The output voltage is dropping to about 2.3V and the circuit isn't working good using this conversion method as I see; even if the voltage is 2V the circuit should work normally.
The converter using 2n3055..
The circuit
I don't want to use a voltage regulator IC such as LM317 because I want only about 15mA 3V for the circuit and the size is small...
Any ideas? it's not a must to use the converter as that I mentioned above, like the first circuit
Hazim
Attachments
-
36.8 KB Views: 844
-
40.1 KB Views: 833