Datasheet links for Ronja

Photodetectors

SFH203 (clear package) and SFH203F (with filter -- not suitable for 625 nm!) photodetectors from Infineon (former Siemens).

Emitters

HPWT-BD00, HPWT-DD00, HPWT-BH00, HPWT-DH00 -- LEDs with punch. Emit at 625nm (red-orange) and red (some more nanometres) visible light. Good as Ronja 10M Metropolis emitter.

Integrated analogue circuits

NE592 Video Amplifier -- fast and cheap amplifier suitable just for Ronja. Has got differential output which is the best for the following comparator.

Discrete parts

BF988 / BF998 (they differ only in the package) -- low-noise RF Dual-gate MOS transistors used as the input stage of the preamplifier due to their low noise, low input capacitance and low reverse-transfer capacitance.
BF 907 pinout.

Where to get the stuff

Optics

The lenses: Chinese "Baloon" manufactures 75mm, 90mm and 110mm dia. relatively cheap lenses made of glass that are slightly bluishly glaucous.

New (26th August 2001): Glass loupes up to 100mm dia. can be obtained for 60CZK and 130mm loupes for 100CZK at various bazaars in Prague (Holesovicka trznice is the best).

Vyvojova Opticka Dilna Akademie Ved CR (Development Optical Workshop of Czech Academy of Science) makes high-quality (and thus expensive) paraboloid mirror, lenses and filters.

Electronic parts

All those electronic parts should be widely available. Ask your local electronic parts distributor. My local distributor has got all these parts.

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