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Welcome to our site! Electro Tech is an online community (with over 170,000 members) who enjoy talking about and building electronic circuits, projects and gadgets. To participate you need to register. Registration is free. Click here to register now.
Hong Kong is a nice place to get electronic components especially Wah Fei in Ap Liu Street.
The 2SK30A datasheet shows that Vgs for 1mA is around -1.5V so using a 1.5K resistor is good for a start.
However, each one of 2SK30A could differs a bit and you'll need to trim the resistance to get an exact 1mA.
Also you have not shown in your circuit what sort of voltage is across the CCS. The 1N5297 is a 0.5W rated current regulating diode while the 2SK30A max Pw is only 0.1W.
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