So I've been given this circuit (attached) that needs to be built due to urgent need and I'm the only maintenance guy here with enough (although not much) knowledge to throw it together. My main problem is that I don't have access to the zener diode and I only have a 9v battery attachment. I have all the other components, as well as some 1N4148 diodes (75v/10ma). Is it possible to lower the resistance to compensate for the 9v battery and somehow use the regular diodes to achieve the same effect as the zener diode? Also, I'm pretty sure they made a typo on the LED and it can actually be 5v or whatever. Anyway, I just have to throw something together that will do a good enough job until I can get the actual parts online. I appreciate any help.
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