I'll cut to the chase, an about me is at the bottom of this post...
I have a standard NE555P fader circuit powered via a 1.2V battery boosted by a QX5252 with 220µH axial inductor (which according to the datasheet should be giving output of 3.5 DCV @ 15 mA to the NE555P). The net max output from the 555 circuit is about 2.5 DCV after an NPN boost, which is OK for my red, yellow & green LEDs but only dimly lights up Blue LEDs.
I wish to boost final power output from the NE555P circuit of 2.5 DCV to 3.0 DCV (or there abouts) @ around 10 to 15 mA.
I'm unsure how to approach the increment problem at such low voltages.
Typical solar garden light circuit. 1.2V 2100 mAh battery boosted by QX5252 with 220 uH axial inductor between pin 2 & 4.
I've modified the output of pin 4 with a shockley diode & a small 603 capacitor = same mod I created via instinct to get RGB functioning in another project, maybe there is a better way (?). Anyway, NE555P doesn't trigger without this mod.
NB: Yes I know the 555 datasheet recommends 5 DCV in. However, other peoples research and my own experimentation proves the 555 can work fine down to 1 volt (which is all well and good if not playing with LEDs which may need between 2 to 3 volts at respectable mA levels to get desirable brightness).
Standard 555 fader circuit. pin 3 (output) via 50k pot plus pins 2+6 to BC547 base, pins 4+8 to BC547 collector. 100 µF cap between pins 1 & 2. LED between BC547 emitter and pin 1 (optional mod for red & yellow LED = appropriate resistor between BC547 emitter and + lead of LED). Power + to pin 8, - to pin 1.
Playing with pin 5 on the 555 seems to be a possible option to increase the DCV output of pin 3, but I could not find any examples on the internet, just a throw away comment that pin 5 is rarely used in circuits but can be used to modify the 2/3 output of pin 3. Somehow I don't think that is going to solve my problem. Instinct is telling me that a simple mod around the BC547 might be a better option (?).
Any pointers to websites or preferably the provision of schematics to advance my project would be most appreciated.
I'm just a retired old fart with limited resources who last played with solid state electronics when SCRs had just become available but didn't get the opportunity to play with them (late 1960s?). I have a fair amount of catching up to do in understanding ICs etc. Apart from the basic VRI formulas I'm at a bit of a loss.
My current aim is to make low powered & solar powered toys and novelties for my grandkids (and me!), and share whatever I create on the internet (once I figure out how to edit videos and have something worth sharing).