You only need one diode to prevent flow the wrong way (that's not call feedback btw). As each diode drops 0.6V, you want to keep the number to a minimum.
Prove the electromagnet part works with charged batteries and then add in the charging circuit.
I'm sorry, but you don't have a clue what you are doing. "Ripping off" crap out of old electronics gear is no way to get useful parts. Before you try to put a bunch of junk together to make something useful, do some research to figure out how it should work. A couple of solar sensor out of calculators is worthless for an electromagnet.
YOU CHOOSE THE WRONG PARTS.....
[1] Mini solar cell provides less than 1mA that shall not able to charge any cell.
[2] 4 batteries connect in series require 5.4V power source for charging. Use 1.5V charging voltage never able to charge them.
[3] Connect blocking diode reduces 0.5V , that means the charging source voltage decrease into 1V
Obtain a solar panel 6V rated 200mA shall fix your problem.
The use of not-frequenly used cells[rechargeable] may affect your storing/discharging of power. So pl. independently discharge your cells, recharge, whether they get 1.4 volts , before doing the solar collection !
Fresh Cu surface is always advisable, so cut the two ends of Cu wire/s, fresh !
Right so, i thought up of something to occupy my time and it just so happens to be an engineering project, at first i drew up my circuit diagram. Then got my parts together. Ive ripped 3 of my pathetic mini calculators to bits (for the solar cells) and ive got 3 solar cells with a voltage of 1.5 each. i found some old rechargeable batteries in my dads cupboard 1.2v each (4 of them). Ive ripped 3 old disk draws apart and managed to get some copper wire from afew motors and by the looks of it an induction coil? and ive began soldering some diodes to the positive sides of the solar cells to protect them from feedback. i plan on putting the solar cells in parallel and the batteries in series. ill connect a diode at the end of the series of batteries to protect them from feedback aswell. i plan on making the circuits input and output separate with a push to make switch, this will allow the input solar cells to fill the batteries up, without directing the energy straight into the electromagnet, this means i can choose whenever i want to direct energy into the electromagnet, allowing for a rechargeable state (im quite aware of the amount of energy it'll use in the time its active).
I need help, Tips and Advice would be nice.
Also, ive checked the energy being produced throughout the solar cells I've already 'played around with abit' and they are working perfectly, from the solar cell, to the diode. BUT, the copper wire isnt conducting the energy needed, i assume it may be coated?
