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Bit cable output 3.3VDC to 12VDC step up converter
I am building small box to disconnect one Antenna when TX on another for protection (long story, you can see my other posts).
Did anyone sourced a reliable DC step up converter from 3.3V to 12V?
I have Flex recommended cable FTDI C232HM that output 3.3V.
I tried 2 different parts so far without success
- https://www.amazon.com/dp/B09245FZ3X?ref=ppx_yo2ov_dt_b_product_details&th=1
Work fine from around 3.9V, but cannot make 12V output from 3.3V. Tried on 2 boards
2. This one adjusted fine to12V but as soon as I canned relay that consume only 34ma, voltage drops to 3V.
I would appreciate some wisdom here , I mean if you figured the part that reliably works and can share :)
Thanks,
Sergey, KN7K
Comments
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It seems like in both cases input voltage drops from 3.3V to 1.9V when this boards activated, that's probably why they fail to produce a reliable output. Still looking for solution…
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Hi Sergey, instead of a step-up converter, you might want to use a switching transistor or opto-isolator to switch 12 volts from a solid source.
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Thank you, Len.
Is there a ready board exist for purchase or do you know where can I find a schematics?
I think i found something like that
https://www.amazon.com/NOYITO-4-Channel-Optocoupler-Photoelectric-Converter/dp/B07TCW947L/ref=sr_1_3?crid=2P89CVHKAG10K&dib=eyJ2IjoiMSJ9.zoE2N0U9PErhZ21Vi8I8-jFpp0Ptx3V_WkcXRWpsZDtlkRttxmSoefF92Bh1mKJVh0beCJSEpM6pm6NEMkYOoz3wdwWunzatPH4IIGMFyRKUOHbfjsaiq2pOvD5aDpdsjI-ryYrdnozxzw8MtAC4DtQSDQEzGKUOQh4rrU8SkjQ1O-rOk2BQMapXfW20CnQOHY0WObqggqp6RikPkl6qDZ6ZEvKOPbgD7lWn1-7dH2E.3f51SRhyNEh1umIo38RRds0XsY9r1OcKWADfdVEUOsw&dib_tag=se&keywords=optoisolator%2B3.3v%2Bto%2B12v&qid=1722487020&sprefix=opro%2Bisolator%2B3.3v%2Bto%2B12v%2Caps%2C137&sr=8-3&th=1
Sergey
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I have had to do this in the past on a Raspberry Pi that have 3.3V I/O interface and Len KD0RC has you pointed in the right direction with using Opto-Isolators.
I don't think there will be near enough drive current to trip a relay.
Some Opto-Isolators uses approx. 170ma of current to light the internal LED's in a Opto-Isolators which the BIT cable should sink just fine.
You can find a LOT of information on line about Opto-Isolators, You may have to use a 2n3904 transistor or 2n7000 FET to invert the BIT cables 3.3V so you have the right output that is in sink with the input.
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Sergey
There are many opt isolated 3.3v boards, with mechanical output relays, designed to be used with Raspberry Pi GPIO pins and Adrinios. Here is one of many examples:
Alan. WA9WUD
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Sergey
These are plug and play for $14 and they are 10A relays. Just a thought.
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Thank you all, great inputs.
One of the reason i did not pickup board with built in relay as I am not familiar with these relays and have to do some research.
My project is to use a relay to disconnect Ant 1 when TX on Ant2 and opposite - disconnect Ant2 when TX on Ant1. So, I have to check that relay can operate 1.8-50mhz without much losses at 100W.
I have a known relay's as spare that used in Steppir Antenna Relay box, so I was planning to use those as they are proven to be good even at high power.
Sergey
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I use these relays to control the relays on the antenna switch.
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Hi Michael, that's what I am trying to avoid, as you would add time delay for each relay in chain, right?
What is your TX Delay in SSDR, 40msec?
Sergey
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I have mine at 20ms, but most of work is on SSB for contesting, so that is plenty long enough. For CW you want it a bit longer, but make sure you follow Ken's document on setting up the entire solution.
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Thank Michael. Ordered relay board that Alan linked above, these relay are 10msec switching time, that should be good.
Thanks everyone!
Sergey
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10-40ms is a pretty small value, and like SWR readings, I think that many people feel that it will impact their ability to make a contact in a contest.
The reality is that the other station will call back the first station that he hears a complete callsign, not the first call he starts to copy.
I only mention this for others who may be concerned with a small bit of latency.
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Completed and tested, all good, thanks
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great job
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