This shield circuit for lamps and other charges was found in a Popular Electronics from the 90's. The MOSFET admits equivalent according to the charging current.
This circuit generates frequencies determined by R3 and C1. We found it in the Radio Electronics magazine...
The configuration below is suggested by the National Semiconductor Linear Applications Handbook. The...
This charger circuit provides an initial voltage of 2.5 V and when the current reaches 180 mA the...