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Replace loud relay with transistor to key radio #14

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opened 2023-08-31 14:18:02 -05:00 by mattbk · 0 comments
mattbk commented 2023-08-31 14:18:02 -05:00
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#13 shows that this board/code can control a relay, but it is loud and large. It should be possible to key the radio with a transistor, even if there is a fair bit of current on the keying circuit (as there is in the NS-80 transmitter, but not the Cricket).

I plan to follow KB1OIQ's design from https://sourceforge.net/projects/kb1oiq-ham-radio-projects/files/80m_ardf/.
image

The transistors I bought are TIP120 NPN Darlington.

#13 shows that this board/code can control a relay, but it is loud and large. It should be possible to key the radio with a transistor, even if there is a fair bit of current on the keying circuit (as there is in the NS-80 transmitter, but not the Cricket). I plan to follow KB1OIQ's design from https://sourceforge.net/projects/kb1oiq-ham-radio-projects/files/80m_ardf/. ![image](/attachments/4165d7e8-6cf3-4401-af5e-a1127c9f15a6) The transistors I bought are TIP120 NPN Darlington.
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W1CDN closed this issue 2023-09-03 11:02:18 -05:00
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Reference: W1CDN/vulpes#14