Mike, WA6ISP has a small PCB that will add 16 more I/O Lines. It runs on the I2C lines, along with 5V and earth. It is 1.750″ x 1.100″ and has 3 address lines, so you can run a several of them and they won’t interfere with the SI5351 (which also uses i2C lines). The chip uses the Adafruit Library for Microchip I2C Expander. Mike has a few built up versions and a few bare PCBs. Email him if interested using his BITX20 list email address.
Ashhar Farhan VU2ESE says:
“HF Signals is keeping the same price for the uBITx because they are able to manage within that price for now. if component prices go up, they might revise the prices.”
What excellent news for purchasers!
David N8DAH has assembled AGC kits for BITx transceivers. These were designed for the BITx20 and BITx40, but should work fine in the uBITx.
The AGC design was posted on DuWayne KV4QB’s site found here and used with permission. All kits will come with:
- PCB x 1
- Parts placement layout x 1
- 2N3904 x 1
- 2N7000 x 1
- 47uf x 2
- 1N4148 x 1
- 100R x 3
- 100k x 3
- 10k x 1 this is extra for the user to play with attack or input values.
- 2k2 x 1
- .1uf x 2 unmarked tan
Missing parts will be replaced.
This is the 3rd run of the boards. Many group members have this AGC already in use.
Cost and options:
#1 – Kits 13$ shipped
#2 – Pre-built OT service 15$ shipped and tested
Write to David if you want to reserve a kit.
NB these are sold out as of 29 January 2018.