Author Topic: Frequency Counter Input Buffer  (Read 1234 times)

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Online ko4nrbsTopic starter

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Frequency Counter Input Buffer
« on: November 05, 2022, 01:39:38 pm »
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
 

Offline BillyO

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Re: Frequency Counter Input Buffer
« Reply #1 on: November 05, 2022, 02:30:58 pm »
You could possibly make up something with a high GBP op amp.
Bill  (Currently a Siglent fanboy)
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Offline ledtester

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Re: Frequency Counter Input Buffer
« Reply #2 on: November 05, 2022, 02:49:16 pm »
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:

1631905-0


 
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Online ko4nrbsTopic starter

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Re: Frequency Counter Input Buffer
« Reply #3 on: November 05, 2022, 03:19:49 pm »
Do you use an input buffer with it?
Bill
 


Offline ledtester

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Re: Frequency Counter Input Buffer
« Reply #5 on: November 05, 2022, 06:05:49 pm »
Do you use an input buffer with it?

No I haven't used it with an input buffer. I haven't gotten around to using it with RF signals.
 

Online ko4nrbsTopic starter

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Re: Frequency Counter Input Buffer
« Reply #6 on: November 06, 2022, 04:53:05 pm »
Hooked it up directly to my old Tektronix Constant Amplitude Signal Generator (Type 191) and the counter worked perfectly. 
Bill
 


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