UK Vintage Radio Repair and Restoration Discussion Forum - View Single Post - Buffer Amplifier for Digital Frequency Counter

Bazz4CQJ · 19th Apr 2021, 3:55 pm

Back in 2016, Skywave (Al) spent a good deal of time working on an amplifier circuit for use as an RF probe which used a 2N4416 at the front and two additional transistors, which was flat to about 100Mhz (an evolution of a Marconi design).

See post #22 here http://www.vintage-radio.net/forum/s...977#post896977. That might be worth looking at, and would certainly work well at 30Mhz.

Having spent some time looking at pre-amps for using with DFM's, quite a few incorporate a chip operating as a Schmidt trigger, so the DMF is fed with a square wave, which is said to be useful.

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19th Apr 2021, 3:55 pm	#8
Bazz4CQJ Dekatron Join Date: Apr 2009 Location: Oxfordshire, UK. Posts: 4,934	Re: Buffer Amplifier for Digital Frequency Counter Back in 2016, Skywave (Al) spent a good deal of time working on an amplifier circuit for use as an RF probe which used a 2N4416 at the front and two additional transistors, which was flat to about 100Mhz (an evolution of a Marconi design). See post #22 here http://www.vintage-radio.net/forum/s...977#post896977. That might be worth looking at, and would certainly work well at 30Mhz. Having spent some time looking at pre-amps for using with DFM's, quite a few incorporate a chip operating as a Schmidt trigger, so the DMF is fed with a square wave, which is said to be useful. B __________________ Saturn V had 6 million pounds of fuel. It would take thirty thousand strong men to lift it an inch.