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RE: RE: Nigels transmitter - problems
- To: "'ukha_d@xxxxxxx'" <ukha_d@xxxxxxx>
- Subject: RE: RE: Nigels transmitter - problems
- From: Keith Doxey <keith.doxey@xxxxxxx>
- Date: Sat, 18 Nov 2000 21:13:46 -0000
- 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
Do you have anything connected to the input, such as a TSOP 1838 ?
The input should normally be pulled high by the TSOP which causes T1 to
turn on and pull the reset line of the 555 low (pin 4).
If you dont have anything connected to the input (R7) then take that to the
+12v rail which will turn T1 on and pull the reset line of the 555 low.
This will stop the LED's.
If that fails then temporarily put a connection between 0v and pin 4 of the
555. that should definately stop it.
HTH
Keith
-----Original Message-----
From: nick [SMTP:mail@xxxxxxx]
Sent: 18 November 2000 11:08
To: 'ukha_d@xxxxxxx'
Subject: [ukha_d] RE: Nigels transmitter - problems
Keith
Thanks for the pointers. I rechecked the transistors and had indeed
transposed collector and base on both. Having rectified this, both Led's
are permanently on when power is applied. I have confirmed this with a
camcorder, R6 is no longer getting hot. I guess pin 3 is permanently high.
What's the likely cause of that?
Thanks again
Nick
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