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John, I have been thinking along the same lines to protect the most expensive component in the sBITX.? Here is what I found in a search on the internet:

Hello Ashhar: I agree with the other gentlemen.? Do not rush and make mistakes.? Instead, take your time.? A good radio is well worth the wait.? And I get to be on the ground floor of Version 2.?

Sorry to come back to this topic again, but the pin 5 is not the I2C SDA? This LOW/HIGH changes would not create some noise in the I2C communication? I created a PR removing such code:

No problem, there are also "off-the-shelf" ones. I'll choose one and test. tks!

I built one with an Arduino nano, a 10uf cap and two resistors. Not sure where I saw the circuit diagram. - f

Thanks Ashhar, there is what I thought. Btw, which "burner" do you use to write the firmware to the ATTiny85? Rafael

A few of you are probably familiar with my experiences with the DE version of the sBitx. There have been quite a number of different things happening which, by Occam’s razor, are in my opinion for

Gerald, Watch the MicroCenter website for Raspberry Pi's if you live near by you may be able to pick one up for a reasonable price. When they get PI's in stock the price is not inflated. A few months

I do not want to hijack this topic so I will start a new one. /g/BITX20/message/101161 73 Evan AC9TU

I did a performance test with my sBITX DE running v2 software and could not run the sbitx code and the Chrome interface on the single Raspberry Pi 4.? That was after swapping out the 2G for a 4G RPi

Cheap too (4N25 $0.16 per 100). Jack, W8TEE

I prefer to use an optic isolator. A lot of protection in a small package.? Max

Ah, a good spot. I wanted to check how fast the adc works. If you see, the pin 5 is being flipped on each iteration of the loop. So, I connected the pin5 to an oscilloscope to measure the time

Rafael, Exposing attin85 pins directly to external lines can be risky. It would be better to tie the tx_line (it goes high on transmit) to a 2n7000 gate and use the drain as an open / close ptt

Hi Ashhar and all, What does it mean this part of the code of the ATtiny85, I don't get it: -- ? if(flag == 1){ ??? digitalWrite(5, LOW); ??? flag = 0; ? } ? else { ??? digitalWrite(5,

If you don't want to use Raj option, other option is to use the ATTiny85 port 6 in order to have independent control (just send the info to the ATTiny85 via i2c). Rafael

I just discovered a kink in spectrum_update that was eating up the cpu. I will push out the changes to idle the cpu back to 40% on sbitx. - f wrote:

I'm really looking forward to this as my command line skills are somewhat limited. Joel N6ALT

Take the 12V from R10 upper side and feed to a 12V relay. Use the relay contacts as you want. The relay will isolate sBitx from your circuit. Raj

Farhan I am not sure about USB spec. The keyline output should go low during transmit to be used for transmit/receive switching of linear amplifiers and transverters. For keyline voltage and current