Here is the simple and low cost NiCd and NiMH battery charger circuit which can be used for various battery type and size. This battery charger use a regulator IC of LM317.
Schematic diagram:
The charge will start if a battery is connected between pins JP1-JP4 or JP2-JP4 or JP3-JP4. For example, if a battery is connected to JP1-JP4 pins then the current that flows cause a voltage drop to R1, then D1 causes a voltage drop of 0,7 volts and ?1 conducts. Then through transistor’s emitter flows a current that comes from Adjustment pin of LM317.
NiCd – NiMH Battery Charger Circuit Notes:
Pins | Battery type |
JP1 – JP4 | AAA |
JP2 – JP4 | AA |
JP3 – JP4 | PP3 & 6F22 |
PCB top and bottom layout:
Guitar Synthesizer Schematic Diagram In this post, we provide a collection of schematic diagrams of…
Handy Talky Schematic Diagram This is an old electronic scheme of the Handy Talky (HT)…
This is an old or "very old" schematic diagram of birdie tone or sound generator.…
Here is the 200W MOSFET amplifier powered based on four piece of IRFP250N, they are…
This is the 300W RMS stereo power amplifier circuit project. This amplifier is based four…
This is an active stereo tone control circuit using very well known op-amp IC of…
View Comments
I have a few doubts on this NiMH battery charger circuit.
>Is there any battery full auto cutt off protection in this circuit?
If not can you tell how can i implement this?