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Customers must check the quality grade of each device. Close to Alkmaar, Netherlands. Some day I’ll figure it out: The Specific quality grade applies only to devices developed based on a. Now, I would like to hear the experts evaluation of this SA control amp schematic. Computers, office equipment, communications equipment, test and measurement equipment. OK, taking the 2SK30A as example.

Rising edges of square waves are nice and vertical. So I set out to find some jfets with the same low Vgs less than 2 volts, closer to 1. Search Only Within This Topic. Circuit description from the manual: So, taking the delta-Vgs from 0V to I chose the 2SK30 since it’s input capacitance is closer to the original 2SK and the scope seems to be working fine.


It was far more complex than I first imagined it to be.

Over temperature the Vgs of both JFETs will track preventing temperature changes from changing the offset from input to output. Since this is a 20MHz scope I panicked a little.

Emitter to ground voltage would be about same as voltage over collector resistor.

You can look for “Vertical Amplifier Circuits” by Tektronix. There is a lot more to be said about JFETs. The Group moderators are responsible for maintaining their community and can address these issues.

2SK30 Datasheet

2ak30 However, there seem some problems in the pre-amp at least a very scratchy volume pot. Dxtasheet Corporation does not assume any liability for infringement of patents, copyrights or other intellectual property.

For a 20 MHz oscilloscope, it would be difficult to find a small signal JFET which is too slow and that is why it worked. On Tue, Nov 17, at The look of panic on my face was replaced by the look of deep confusion. While NEC Corporation has ratasheet making continuous effort to enhance the reliability of its semiconductor devices.


You must log in or sign up to reply here. On Wed, 18 Nov So how is it that a jfet specified for low frequencies can be used for 20MHz bandwidth scope? Thank you again for a great answer. The incorporation of these circuits.

2SK30 Datasheet(PDF) – NEC

Even Fairchild made a ksk30, y grade has a Idss of 1. Reason Report to Moderators I think this message isn’t appropriate for our Group. I realize 20MHz ain’t all that much, but it’s quite a bit higher than “audio” I would think.

I read about the design, dont remember where, of the input amplifier to the Tek scope.

Transportation equipment automobiles, trains, ships, etc. When excessively high-amplitude signals are applied to the 2sk0 follower, the signals will be Q and the gate-source junction of Q