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Chinese frequency counter module
Mondial
Phorum Expert
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Posts: 1,114
Threads: 14
Joined: Feb 2013
City: Irvington, NY
#3

12-01-2016, 10:09 PM
One thing to be careful of is input loading. The counter has a MOSFET front end and a pair of back to back protection diodes from input to ground, so if the signal is more than 0.7 v peak the diodes will conduct and load the measured circuit. Better to add a series resistor to reduce signal if it is at high level as in a tube osc circuit.

Actually, the time base is very good. It has a TCXO designed for use in cellphones, rated at 2.5 PPM.  Amazing the quality of mass produced parts these days. Better specs than expensive counters of a few years ago, and all for $9 including shipping!
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Messages In This Thread
Chinese frequency counter module - by Mondial - 12-01-2016, 05:42 PM
RE: Chinese frequency counter module - by Mondial - 12-01-2016, 10:09 PM
RE: Chinese frequency counter module - by Mondial - 12-02-2016, 09:27 AM
RE: Chinese frequency counter module - by Mondial - 12-20-2016, 09:38 PM
RE: Chinese frequency counter module - by Mondial - 02-09-2017, 04:40 PM
RE: Chinese frequency counter module - by Arran - 04-02-2017, 04:17 AM
RE: Chinese frequency counter module - by Mondial - 04-12-2017, 01:01 PM
RE: Chinese frequency counter module - by morzh - 11-30-2017, 03:54 PM
RE: Chinese frequency counter module - by govee - 01-25-2021, 04:03 PM



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  1. The PHILCO Phorum
  2. Various and Sundry Categories
  3. Test Equipment