Here's a simple circuit: **broken link removed**
You didn't mention type of battery or circuit so we're flying blind..If your circuit has an on board voltage regulator the charging voltage shouldn't be an issue...
Here's a simple circuit: **broken link removed**
You didn't mention type of battery or circuit so we're flying blind..If your circuit has an on board voltage regulator the charging voltage shouldn't be an issue...
Heh heh. Someone's gunning for that record post count! Anyway, Ralph Tenny from DPRG has a good NiCad-charging device at: **broken link removed**. There is also a miniaturized 50mA version in the App Notes section of National's LM317L Data sheet.
Just a single resistor off a higher voltage supply, calculate the resistor value using ohms law - that's all you require for a trickle charger, and is what you will find in most commercial chargers.