Comments on: Two Simple Jobs – GEEPAS GMS8575 AMPLISpeaker & Local Make Gate Opener Remote

By: Parasuraman S

Parasuraman S — Mon, 23 Feb 2026 13:07:40 +0000

In reply to Waleed Rishmawi.

Many thanks for the lead!

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By: Waleed Rishmawi

Waleed Rishmawi — Mon, 23 Feb 2026 07:49:05 +0000

In reply to Parasuraman S.

the device name is CNBJ-501. i can not remeber the cost but not expensive but it is worth it.

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By: Parasuraman S

Parasuraman S — Sun, 22 Feb 2026 07:46:37 +0000

In reply to Mark J.

Ha, Ha! Many thanks for your comments, dear Mark!

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By: Parasuraman S

Parasuraman S — Sun, 22 Feb 2026 07:45:40 +0000

In reply to Yogesh Panchal.

Many thanks, dear Yogesh Bai!

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By: Parasuraman S

Parasuraman S — Sun, 22 Feb 2026 07:44:39 +0000

In reply to Waleed Rishmawi.

What is the name of this device and what is its cost? Kindly share! Many thanks for your comments and lead, dear friend!

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By: Mark J

Mark J — Sat, 21 Feb 2026 19:23:13 +0000

Double satisfaction for sure. Good job on the repair.

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By: Yogesh Panchal

Yogesh Panchal — Sat, 21 Feb 2026 09:39:49 +0000

Good Job! Sir

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By: Waleed Rishmawi

Waleed Rishmawi — Sat, 21 Feb 2026 09:27:27 +0000

i get many cases like that either dirty, cold solder or rustey keys and pads..they usually come back to life once these issues were dealt with. I have purchased a special device that tests door remots, car remotes and mostly all kind of remotes which all come handy when testing these devices. have a blessed day my friend.

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By: Parasuraman S

Parasuraman S — Sat, 21 Feb 2026 09:24:01 +0000

In reply to Albert van Bemmelen.

Expert comments packed with experience and technical data, which many of the techies would find it very, very useful! Many, many thanks, dear Albert!

The local make RC Unit was reportedly working fine.

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By: Albert van Bemmelen

Albert van Bemmelen — Sat, 21 Feb 2026 08:58:23 +0000

I guess that the regular customer also verified that the RC Unit of his Local make Gate Opener was working.
For checking RFID,NFC,Sub-GHz,and even IR,iButton,Wifi and Bluetooth signals I recently am able to check all those signals and much more with a portable Flipper Zero. It even can copy keycards, read my bank card, open Tesla cars and also local gates with its upto sub-GHz frequency transmitter/receiver. Also switch on/off all sorts of television sets remotely, and block all nearby Apple smartphones which is dangerous! The Flipper Zero is a universal engineer's portable little but expensive gadget for hacking and debugging. It is like the Pwnagotchi portable device, that you much cheaper can make yourself, but with many more functions!
But testing if an ultrasonic upto 40KHz audio device is working (like those Ultrasonic Dog Repellers that often can't be opened), I found that its audio signal easily can be tested by simply connecting a large Piezoelectric Plate as transducer to the bnc input of my oscilloscope(s).

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