Datasheet links for Ronja
Integrated IR transceivers
- HSDL1001 transceiver. Suitable for Ronja -- Cheap (as can go only at 115200 bps and
doesn't have the integrated EMI shield). The transmitter is not usable
in Ronja. Works as and integrated receiver that generates directly TTL-level
pulses on the output.
Integrated analogue circuits
- HSDL7000 -- not much cheap IC that does interface between NRZ signal from RS232 (but in 5V levels) to the IrDA SIR modulation pulses. Needs a clock.
- MAX 232. Interface between RS232 (+/- 12V levels) and 5V levels. Uses only a single
5V power supply and generates the necessary levels internally by pumping electrons over capacitors.
Where to get the stuff
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 at various bazaars in Prague.
Czech firm Eopta makes credit-card sized
Fresnel lenses that look like this.
You can buy magnificient A4-sized lenses at Edmund Scientific. These may be obtaines also at optician's or a shop for sight-impaired people (used for enlarging whole pages of text).
You can get A4-sized fresnel
lens for 220CZK at Sight-impaired shop Tyflopomucky
Olomouc in Czech Republic. They also send it by mail. The loupe looks like this.
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.
All these electronic parts should be widely available. Ask your local
electronic parts distributor. My local distributor has got all these
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