[Laser] Error in G0MRF receiver circuit?

[Zack Widup]

Well, the schematic he shows is completely screwed up around the OPT301.  
I overlaid the board pattern and the parts layout drawings he has on his 
site and it seems more accurate but there are parts missing from the parts 
layout.  It appears he does have board pattern lands for a resistor in 
series with the zener but he left the part and its value off the parts 
layout drawing.

Back to the drawing board for him!

Zack W9SZ

On Fri, 20 Oct 2006, Paolo Cravero wrote:

> Hi,
> while waiting for my ChinaCheeapo laser keychain pointers and OPT202 
> photodiodes, I'm preparing to build the receiver.
> 
> I spotted G0MRF's circuits, that should support OPT202:
> http://www.g0mrf.freeserve.co.uk/laser301.htm
> 
> However, comparing the "single-supply" figure on the OPT202 datasheet 
> with the circuit shown on that page, something puzzles me.
> 
> The zener diode on the datasheet has a resistor coming from +Vcc, while 
> the resistor is missing on MRF circuit. I tend to think that the 
> resistor slipped from MRF's circuit, and datasheet is correct (also 
> according to my knowledge of how zeners work).
> 
> Anyone can comment?
> Paolo IK1ZYW
> 
>