Led Flasher LOW VOLT
The following schematic is of the discrete component replacement for the LM3909.
Click to View Circuit and read more
The values of the components were chosen to match those in the integrated circuit however resistor R5 is a guesstimate fit as the Q2 portion of the circuit as Q2 in the integrated circuit is a “current mirror” which is a type of current regulator.
The Q2 portion of the circuit could not easily be duplicated using individual transistors but could be replaced with dedicated current mirror device.
….
Thank you.
Power Supply Switching Power Supply DC to DC Converter Inverter
Battery charger Led flasher Motor speed controller LM317 IC 741
RF radiofrequency Electronic control Digital Circuit Alarm home system
DC to DC converter step up voltage Mini project Temperature control
FM receiver Dual power supply Fluorescent lamp Pic microcontroller
Led display RF amplifier FM transmitter LM324 LM723 TL494
2N3055 LM338 SG3525 Li-ion battery charger Pulse generator
Best View 800x600 pixel
Email : 
Copyright 2008 www.elecfree.com/electronic/
