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| Hi $ALL! I just assembled a handyboard. The assembly documentation (hba.pdf) says, that there should be a ~40kHz square wave at pin 2 of U9 (HC04). My frequency counter shows 72 kHz... So I took a new capacitor (682) and a new resistor (3k83) but (...) (23 years ago, 11-Nov-01, to lugnet.robotics.handyboard)
| | | | | Re: IR port
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| see the v1.21 parts list in the hardware section, for the following info: re: R4's value. Depending on the variety of the manufacture of the HC132 chip, R4 should be either 3.83K (Digikey 3.83KXBK-ND) or 6.81K (Digikey 6.81KXBK-ND). To test this, (...) (23 years ago, 11-Nov-01, to lugnet.robotics.handyboard)
| | | | | Re: IR port
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| Am Sonntag 11 November 2001 22:04 schrieb Fred G. Martin: (...) Aaahhh, 6.81K gives me 43kHz - I think I will have a look at some higher values. I did not know that the HC132 could be that much of a difference! Big THX! Chris (23 years ago, 11-Nov-01, to lugnet.robotics.handyboard)
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