I’ve been prototyping a flexible CCS PCB. The intent is to provide a cascoded FET pair with some interesting features:
- The lower FET can be multiple devices depending on the choice of reverse capacitance and transconductance. These include jFETs and depletion MOSFETs like the 2SK170, J310, BF862 and of course DN2540. For this purpose several pads are provided for SMD devices as well as TO-92 ones, just like the gyrator PCB. A protection Zener diode between drain and source can be soldered when using low VDSS devices.
- There is either a string of trimpot plus a resistor to set the CCS current manually during test given the variance in the FET parameters. There is also an option to put a fixed resistor.
- There is a mu-output connection provided.
The board is very flexible and can be used for multiple purposes:
- shunt regulators (including VR valves)
- Anode load for phono preamps, drivers, LTPs, etc.
- LTP tail CCSs
I’ve been running some tests with excellent results.
If there is interest, I will run a batch of PCB to offer to the DIY community.
Cheers
Ale
Very, very welcome indeed. I believe since Gary Pimm is no longer offering his CCS boards, a high-quality iniative is very welcome…ideally as well a hybrid version (with some tubes ?)…
Definitely interested!
I would be interested in a few sets.
Count me in. I would like to have several pair.
I would also be interested. Very useful tools
Happy New Year! I would be interested in 6-8 boards. Thanks again for doing this!
Hi Everyone,
After extensive testing I made changes to the PCB again and ran a new prototype PCB batch which will be available in 2 weeks. Hope to get the final boards ready by end of January or February.
I added some additional SMD FET options as well as SMD gate stoppers.
Once is ready, I will let everyone know about availability, etc.
cheers
Ale
New prototype boards worked just fine! Made a few tweaks again and sent a full production batch. Fingers crossed, the PCBs should be available in 2 weeks or so. I will let everyone know. Stay tuned!