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1) Some states of this product need to be installed by the customer.
2) There is no manual for this tester. Therefore, customers should have the relevant knowledge to purchase this product.
3) 32.768 kHz crystals cannot be tested.
4 When testing 48 MHz it shows 16 MHz using 3 frequency bars.
Packing List
1) 1pc 80 x 55 mm PCB board
2) 5pcs 2.54 cm red LED digital tube 5161 as
3) 10pcs 1 K resistor
/> 4 ) 2 pcs 10 K resistors
5 ) 5 pcs 100 K resistors
6 ) 4 pcs set of 1 N4148 do-35 diode
7 ) 1 pc DC5 – 9 V power supply Connector
8 ) 1pc pic16 °F628
918pin socket adapter
10 ) 3pcs transistor ( 9108 9104 7550 1pc
11 ) 1pc 20 MHz crystal oscillator
12 ) 3pcs 22pf capacitor
13 ) 2pcs 104 33 MH inductance
14 ) 1pc switch
151pcs 3 pin 2.45 mm pitch
16 ) 1pc adjustable Capacitor (yellow)
Customer
Reviewed in the United States on February 23, 2024
Really does not work as a Freq. counter, which is what I bought it for. May work as a crystal checker, but not what I was trying to do.
Michael S.
Reviewed in the United States on April 17, 2024
Kits these days have never heard of Heathkit, or even Velleman either. But this kit is better than most others for how well it comes together quickly. Component knowledge needed -- a bit to be honest. But attentive builders lacking many hours of kit building can sort this one out. Recommend.
Chuck S.
Reviewed in the United States on May 27, 2023
Has an issue with one of the voltage regulators but replaced with new one. Not a problem with device supplier just the people that supply their parts. Crystal oscillator won't be able to give precisely the frequency but will let you know if it's in the ballpark. Will tweak to my liking later.
Tim
Reviewed in the United States on October 10, 2023
Works like a charm for checking crystals within tolerance.
Harvey Anderson
Reviewed in the United States on September 21, 2022
Fun to put together and could be used for some applications
Nick
Reviewed in the United States on February 12, 2021
I needed an affordable frequency counter to replace my Fluke multimeter in a project which uses six oscillator-sensors to measure fluid levels. The oscillators operate between 10 and 20kHz frequencies, and I installed the counter in the project box which switches between the six oscillators for measurement. The Huaban 2 Pack kit seems well-made, and provided all the parts necessary to assemble two counters. No documentation is provided with the kit, however there are other websites which have additional information about this kit and the theory behind its operation. The parts and printed circuit board are labeled, and it only requires some soldering skill and basic knowledge of electronics to install the components.In my case, I eliminated the crystal test circuitry, and used the spaces on the PCB to place two resistors and a capacitor to act as a low-pass filter to provide a conditioned input frequency signal to the counter circuitry. My oscillators produce a square-wave signal of about 15kHz, at 7.6V, and with switching spikes up to 15V in the 3MHz range. Other commentators had noted the danger in providing higher voltages to pin 3 of the microprocessor than the 5.5V Dcc supply voltage, so I used two 6.8kΩ resistors and a 0.33nF capacitor to drop the signal to 3.9V and eliminate the high frequency ringing. (Two earlier attempts using lower values of the second resistor resulted in input voltages of 1.8V and 2.3V, which were inadequate to fully trigger the counter).I powered the board using a 9V DC supply, which the onboard voltage limiter safely reduces to 5.5V appropriate for the microprocessor. Once I found the best voltage to provide to the counter input, the unit functioned perfectly, and agreed with my Fluke multimeter to the 5th digit, for an accuracy of better than 0.01%.A quality kit for a very reasonable price!
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