Circuit controls intensity of reflex optical sights:
02/21/2002 EDN - Design Ideas / A popular
category of aiming/pointing aids is the reflex, or
"red-dot," sight. This system finds use in such
diverse applications as astronomy, archery, and
shooting. In the reflex sight, light from an
internal source-typically a high-intensity red
LED-reflects from a curved, transparent optical
(reflex) element through which you view the target.
Design a visible optical link for RS 232C
communications: 01/09/03 EDN-Design Ideas
/ The design in Figure 1 is a visible optical
link for those who need to see the transmitted data.
An isolation figure of more than 5000V is a bonus.
Tests of the system used the COM input of a
data-acquisition system, as well as a standard PC's
COM port. The MC1489 converts the RS-232C data to
Simple CATV Upstream Fiber Optic Receiver Uses DC
Pilot AGC: 01/20/03 Electronic Design - Ideas
for Design / Upstream fiber links in a community
antenna television (CATV) system are usually among
the most difficult elements of the network to align
properly. Set-top boxes and cable modems employ
"long-loop" automatic gain control (AGC) (in other