208Views4Replies

Author Options:

Capacitor Bank charger without flash circuits Answered

I want to make a capacitor bank and cant find a charger circuit.
I cant seem to find any secondhand disposable cameras and would greatly appreciate help making one without the circuit.

Comments

The forums are retiring in 2021 and are now closed for new topics and comments.
0
Orngrimm
Orngrimm

8 years ago

I made such a thing once and it was quite easy:
I used the selfinducting voltage of a charged coil to pulse-charge the cap.
0.: Get a REALLY big coul... made mine myself with thick copper (insulated) and had 210mH and capable of 3 Amps.
1.: power the coil with 12v or other adequate means of DC-power to not overshoot the max current in your coil.
2.: Power the coil up till you reach a steady state in current (Doesnt change much anymore) or till you reached a certain current-level (Like the max your coil should handle).
3.: Cut off the supply and the coil starts to selfinduce voltage
This voltage is directed (over a diode of adequate size) into the cap-bank.
4.: Let the coil cut off till the current in the col drops below a certain minimum (I had 100mA)
5.: goto 2.:

All the sensing and switching can be done with Operational amplifiers (Sensing, deciding) and large FET's. So it can be done 100% discreet.

0
uditkotnis
uditkotnis

8 years ago

Well, do you have any ideas how to make one?
If someone just posted a circuit diagram for one of the flash cameras people without a camera could whip one up.

0
mpilchfamily
mpilchfamily

Reply 8 years ago

I gave you all the information you needed to find the circuit on your own. Many diagrams and schematics are easily available online. Have you tried doing an internet search for a DC to DC boost converter schematic/ circuit diagram?

0
mpilchfamily
mpilchfamily

8 years ago

Look for a DC to DC boost converter that will output the voltage you need for the capacitor bank. All the camera flash circuit is, is a boost converter.