Looking good.
For the record I always prefer using heatsinks that overhang the end of the Calvin pcbs and then drilling them to mount astride the main pcbs. Less hassle than mounting them through the paradise pcb.
For the record I always prefer using heatsinks that overhang the end of the Calvin pcbs and then drilling them to mount astride the main pcbs. Less hassle than mounting them through the paradise pcb.
Hi. Packed all the PCB sets without parts today and went to the post office. The waiting line was LOOOOOONG, probably 1Hr-1.5Hrs waiting time...
Will try again tomorrow morning...
SB
Will try again tomorrow morning...
SB
Finally was able to ship my envellops. Check your email for shipping confirmation.
Keep in mind that with all the air traffic reduction, longer shipping delays are to be expected...
Tomorrow will try to start matching the Calvin parts. Stay tuned
SB
Keep in mind that with all the air traffic reduction, longer shipping delays are to be expected...
Tomorrow will try to start matching the Calvin parts. Stay tuned
SB
Last edited:
Still a few Paradise PCB kits with pre-reg and CRC filter left. I'll probably have enough Calvin buffers to go with it as well...
Let me know if interested
SB
Let me know if interested
SB
Hi. sq225917 already answered by private email, sorry for the delay. As I said was side track with a lot of other projects here locally, repaired, and Covid related delay in our day to day. Everything now take so long...
Anyway started the JFET test and matching for the Calvin sets. Here getting prepare for curve tracer testing of all 200 PF5102 JFET. Then I'll double check on my own Calvin pcb.
Long work ahead of me...
Stay tuned
SB
Anyway started the JFET test and matching for the Calvin sets. Here getting prepare for curve tracer testing of all 200 PF5102 JFET. Then I'll double check on my own Calvin pcb.
Long work ahead of me...
Stay tuned
SB
Attachments
I compared the both matching methods (with curve tracer and the suggested test gig as included with the docs), and both gives similar results. I already have matched sets and the zero output adjustment is rock steady and easy to adjust. I should be able to ship the remaining Calvin pcb with matched transistor sets by the end of the week.
Since I tested them in the actual circuit, with the actual pcb, you should be able to get exactly the same result as me...
BTW while I assembled a test pcb to check the parts matching I realized that the pcb silkscreen for R1 & R2 is incorrect, and should be reversed. The circuit will still work as it is since both 100R & 75R resistors are so close in value, but it is better to assemble the pcb according to the schematic. Sorry for that... See the included correction.
Stay tuned for updates.
SB
Since I tested them in the actual circuit, with the actual pcb, you should be able to get exactly the same result as me...
BTW while I assembled a test pcb to check the parts matching I realized that the pcb silkscreen for R1 & R2 is incorrect, and should be reversed. The circuit will still work as it is since both 100R & 75R resistors are so close in value, but it is better to assemble the pcb according to the schematic. Sorry for that... See the included correction.
Stay tuned for updates.
SB
Attachments
vasillis you have mail. You are the last member on the waiting list. You wanted a complete kit + Calvin + Matched parts, it is available for you. Please get back to me.
Thanks
SB
Thanks
SB
Seem I'll be able to sell more Calvin Buffer Semiconductor matched sets with the extra 100 PF5102 I have in stock. The complet matched set includes: PF5102 matched, J107 near Vgs, and unmatched KSA1381.
Let me know if you are interested, if yes I'll need to buy extra J107 and KSA1381 to complete the extra kits.
Thanks
SB
Let me know if you are interested, if yes I'll need to buy extra J107 and KSA1381 to complete the extra kits.
Thanks
SB