I often need a low current negative voltage for prototyping on a solderless breadboard.
Here is a simple circuit to do that. This circuit can supply about 50 ma at -4 volts with +5 volt input. It uses a LT1054 but an ICL7660 or LT1044 could be used if lower output current is acceptable.
I used the 47uF, 6.3 volt ceramic caps because I had them and they have the required low ESR (less than 0.1 ohm). Being surface mount, I had to get a bit creative wiring them.
The entire circuit is built on a small piece of pad-per-hole prototyping board. My connector is a 0.1" spacing header with 0.025" diameter pins.
Here is a simple circuit to do that. This circuit can supply about 50 ma at -4 volts with +5 volt input. It uses a LT1054 but an ICL7660 or LT1044 could be used if lower output current is acceptable.
I used the 47uF, 6.3 volt ceramic caps because I had them and they have the required low ESR (less than 0.1 ohm). Being surface mount, I had to get a bit creative wiring them.
The entire circuit is built on a small piece of pad-per-hole prototyping board. My connector is a 0.1" spacing header with 0.025" diameter pins.
Attachments
-
2.2 KB Views: 11
-
1.1 MB Views: 9