pb908
Well-known
I have made simple schematic for you all, this is what I have use on almost all of my RF.
most RF use 1.35V, 2.7V, or 5.6V
my solution for all battery :
1. 1.35V battery, normally I put SR44/LR44 (with o-ring for 625 size) and connect a germanium diode (hard to find, need to test it first to find 0.2V voltage drop) inside the RF it self, so later on I just need to change the 1.5V battery
2. 2.7V battery, on my Lynx 14e, I use 6V battery (4 x 1.5V LR44), or can be higher battery, and modify the battery chamber to accept those higher batteries, open the bottom cover of my Lynx and find the red cable which is the power cable coming from the metering switch. I use LM317LZ and with just 2 resistor I manage toregulate the higher voltage to be 2.7V.
as this circuit always takes 5mA current during ON condition, that's why I prefer to use it on any RF which have On/Off switch to enable metering (lynx 14E is perfect example). that will save the battery for long time
On my case, Lynx 14e, I need to get 2.7V so I use 290ohm resistor as per this calculation below :
you can modify the R value to for another voltage you need. few things to be note is that you need to have voltage at higher than the value you want to get, at least 1.5V higher if I am not wrong.
3. and the last solution for my Yashica GL (5.6V) :
there are few option, but on mine, I use Cr/MN 21 or 23 (12Volt battery that is used on car key remote, alkaline) which is cheap and powerfull (more than coin type battery). and drop the voltage with zenner diode (5.6v) and one common silicon diode (I use 1n4007), and I get 5.7V at the end of the circuit. I installed all the diodes inside camera (I need to open the bottom cover) and solder the diodes on battery compartment), modify the battery compartment to accept the MN/CR 21/23 size (another spring and a foam) and my GL is up and running !!!
hopefully this help some people..
Regards
BK
most RF use 1.35V, 2.7V, or 5.6V
my solution for all battery :
1. 1.35V battery, normally I put SR44/LR44 (with o-ring for 625 size) and connect a germanium diode (hard to find, need to test it first to find 0.2V voltage drop) inside the RF it self, so later on I just need to change the 1.5V battery
2. 2.7V battery, on my Lynx 14e, I use 6V battery (4 x 1.5V LR44), or can be higher battery, and modify the battery chamber to accept those higher batteries, open the bottom cover of my Lynx and find the red cable which is the power cable coming from the metering switch. I use LM317LZ and with just 2 resistor I manage toregulate the higher voltage to be 2.7V.
as this circuit always takes 5mA current during ON condition, that's why I prefer to use it on any RF which have On/Off switch to enable metering (lynx 14E is perfect example). that will save the battery for long time
On my case, Lynx 14e, I need to get 2.7V so I use 290ohm resistor as per this calculation below :
you can modify the R value to for another voltage you need. few things to be note is that you need to have voltage at higher than the value you want to get, at least 1.5V higher if I am not wrong.
3. and the last solution for my Yashica GL (5.6V) :
there are few option, but on mine, I use Cr/MN 21 or 23 (12Volt battery that is used on car key remote, alkaline) which is cheap and powerfull (more than coin type battery). and drop the voltage with zenner diode (5.6v) and one common silicon diode (I use 1n4007), and I get 5.7V at the end of the circuit. I installed all the diodes inside camera (I need to open the bottom cover) and solder the diodes on battery compartment), modify the battery compartment to accept the MN/CR 21/23 size (another spring and a foam) and my GL is up and running !!!
hopefully this help some people..
Regards
BK
