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Old 20th Mar 2017, 2:40 pm   #8
Specmaster
Triode
 
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Join Date: Mar 2017
Location: Chelmsford, Essex, UK.
Posts: 38
Default Re: Frequency counters

I've built the JFET source follower and if anything it is actually worse now. The maximum output from it is 5mv half wave with the signal generator set at maximum output. Ok, I don't as yet have the frequency counter as shown in the first post, still on-route, but I do have one built into my function generator MHS-5200A which I have been using.

With the supply set at 12v it gives 3mv and cranking the supply to 20v gives 5mv output and I suspect that the MHS-5200A demands all of that especially at FM and above frequencies.

I have a Black Star Meteor 100 arriving soon but even that needs 10mv, can this low level signal be further amplified to produce something in the realms of 20mv or so and can anyone suggest a circuit that I could incorporate with the source follower to allow the counter to operate correctly?
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