Led Flasher with IC 555 Circuit
A dual tandem flashing light circuit powered by a 9 volt battery,
This circuit is powered by a 9 volt battery, suitable for warning lights on a tall structure. (Personally, I can’t recommend you buy anything but the Rollins Railroad Designs kit; for $4.00 you can’t go wrong. The 555 IC [...]

The original CK217 was an improvement on the CK200 FM Transmitter. This new FM Transmitter can transmit over 900 feet in the open depending on aerial used. The tank oscillator coil is built into the circuit board, and has been tinkered with to give the best distance and stability for it’s size. The battery supply [...]

Low cost solution for charging of both NiCd and NiMh batteries
Here is the circuit diagram of a low cost universal charger for NiCD – NiMH batteries. This circuit is Ideal for car use. It has ability to transform a mains adapter in to a charger . This one can be used to charge cellular phone, [...]