Led display for battery low volt
This circuit uses just integrated number circuit LM3909 and capacitors outside. It work by use NiCad battery 1.25V sizes. or The dry cell is small-sized is other. The circuit can do to copy is like , prevent many the group. For use show winking according to want Battery Charger Circuit that add come to this use solar cell model silicon or Diode for battery Charger automatically is at day time.
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LED Flasher with SCR and UJT
This circuit systematically main work from Oscillator Circuit. It is use UJT. The Q1 will give the period of time of pulse for trigger. The work of SCR for drive LED. The circuit will pull current 2 mA from just Battery 9V. When the schedule is Flasher keep 12 time per second The SCR use at have 6A 50V. Idea circuit this sizes may advantage with friends , please sir.
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Battery 1.5V or 3V Monitor using LM3909
We come to add LED Flasher for Monitor the electric current of battery 1.5V and 3V. By use the integrated circuit LED Flasher or Oscillator. By the rate something flasher equal to 2V. This circuit eats electric a little current poor age the work of battery long can’t be like be usable. If friends use battery 3V as a result liberate pin 1 float keep. I hope that a friend may apply with Battery 1.5V or 3V Monitor Circuit , please sir.
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