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Frequency Counter Input Buffer

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ko4nrbs:
Any suggestions for a buffer for this counter?
https://usa.banggood.com/1Hz-50MHz-High-Sensitivity-Frequency-Meter-Counter-Measurement-Tester-Module-7V-9V-50mA-p-1662557.html?cur_warehouse=CN
I tried a pickup coil but couldn't get it to pick up the signal.  I am trying to check the output frequency of an old Heathkit HG-10 VFO.  Its output is at 5 volts RMS open circuit.
Thank you,
Bill

BillyO:
You could possibly make up something with a high GBP op amp.

ledtester:
I have this kit and built it but I can't remember if it came with a schematic or not.

In any case, in this thread:

https://antiqueradios.com/forums/viewtopic.php?f=8&t=391757

I found a reconstructed schematic which shows the input section:




ko4nrbs:
Do you use an input buffer with it?
Bill

Grandchuck:
You could try one of these:

https://www.aliexpress.us/item/3256802963755345.html?spm=a2g0o.detail.1000060.1.9ab4792duzHSa7&gps-id=pcDetailBottomMoreThisSeller&scm=1007.13339.291025.0&scm_id=1007.13339.291025.0&scm-url=1007.13339.291025.0&pvid=9e709335-b039-46f3-b2ef-704b3131bb58&_t=gps-id%3ApcDetailBottomMoreThisSeller%2Cscm-url%3A1007.13339.291025.0%2Cpvid%3A9e709335-b039-46f3-b2ef-704b3131bb58%2Ctpp_buckets%3A668%232846%238113%231998&pdp_ext_f=%7B%22sku_id%22%3A%2212000024369199718%22%2C%22sceneId%22%3A%223339%22%7D&pdp_npi=2%40dis%21USD%213.76%212.9%21%21%21%21%21%402101d1af16676622808262566e0ffc%2112000024369199718%21rec&gatewayAdapt=glo2usa&_randl_shipto=US

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