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Re: IR filter material
- To: ukha_d@xxxxxxx
- Subject: Re: IR filter material
- From: Nigel Orr <Nigel.Orr@xxxxxxx>
- Date: Tue, 26 Sep 2000 15:02:57 +0100
- Delivered-to: rich@xxxxxxx
- Delivered-to: mailing list ukha_d@xxxxxxx
- Mailing-list: list ukha_d@xxxxxxx; contact
ukha_d-owner@xxxxxxx
- Reply-to: ukha_d@xxxxxxx
At 13:33 26/09/00 +0100, you wrote:
>Nigel's circuit (or something very close) was shown in an electronics
>encyclopaedia
There can only be about 3 variations of 555-timer-based astable
multivibrators, I'd expect it to be similar, though they probably
remembered to connect up the power supply on the schematic, which would
help... :-)
>, and they suggested the following to provide a filter for IR
>in general:
Apparently some black insulating tapes make a good IR filter. If you have
a CCTV camera or camcorder, they are usually sensitive to IR, so you can
test the effectiveness of various filters easily.
Nigel
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