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Your cart is empty.Product Description
Package Included:
- 1 x 4 Channel DTMF Tone Signal Decoder Relay
- 1 x cable
Specifications:
Weight: 72g
Maximum load: 10A/250VAC ,10A/125VAC,10A /30VDC, 10A /28VDC ,10A /12VDC
Easy to Use
Eight modes of operation: Non-locking (Momentary ), self-locking (Toggle), inter-locking(Latch), 5/20/60/120/250-second delay
4 Channel DTMF Tone Signal Decoder Relay
Working voltage DC 12V, with reverse polarity protection
Operating Current: Standby 11-13 MA, 1 relay
The default control command is 1/2/3/4
Jennifer
2025-08-24 15:56:03
This device is very simple in basic function. A little relay responds to the appropriate DTMF code by either opening or closing a circuit. But you need to feed it the DTMF data correctly.I use a couple ham radios. Audio cable from the receiving radio goes into the DTMF board. Now, turn the receive volume all the way down and press whatever DTMF code you are testing (I'll use 1 in this example). The board will moat likely not respond. Why? Because the audio volume is too low. So while you are transmitting DTMF number 1 (eg: mashing on the #1 button while keying the radio), start to turn the volume up on the receive radio. You will eventually hit the 'sweet spot' where the tone is deciphered correctly and you will hear the little relay click and see the LED light up.If you turn the volume up too high, the board will then quit responding again. You could go off of something like discriminator audio at a constant volume, but let's not muddy the waters in this review.As for programming different DTMF codes, the instructions are all over the internet. Took less than five minutes to find them. For the Google impaired, here is a brief description of the programming basics.1.With the board powered on, push the little "key" button one time and release. No need to hold it. The power LED on the board will go out (this is what it's supposed to do).2. Use whatever DTMF device you did the initial testing with that I describe above. I used my two ham radios that I previously set the correct volume to and made sure worked with the factory set DTMF tones.3. On your transmitting device, begin transmitting and push the '#' sign (pound sign for the non-millennials), followed by whatever channel you are wanting to program (let's use 4 in this case), followed by whatever DTMF code you would like; up to four (4) digits. Once you have typed in the new code (and while you are still keying the transmitting device), type '*'.4. Momentarily push the 'key' button again to exit programming mode. The power LED should turn back on.So, Let's say I want to change channel 4 to a code of 0000..Hit the 'key' button.Transmit #40000*.Stop transmitting.Push 'key' button again.A caveat: if you want to change 4 to something like 1234, you can do that just fine using the above technique. But be advised that unless you reprogram the first three channel from their default, pushing '1' will trigger channel 1, 2 will trigger channel 2, 3 will trigger channel 3, and 1234 will trigger channel 4. So a little effort has to go into programming this the way you actually want it.Now go forth with the knowledge and quit complaining that you can't work the board. The board works perfectly as long as you are using it correctly.
Technician Dave
2025-08-20 11:14:45
If you know what a DTMF decoder does, this is exactly as advertised. Four outputs, each listens for a DTMF tone. DTMF1 activates relay 1, DTMF2 activates relay 2, etc.It can be configured to 'pulse' the relay on for 2ish seconds, or it can be set to on/off (beep 1 for relay 1 on, then beep 1 again to off)... and there's some other features. Runs on wide voltage range, it needs lots of audio signal coming in the plug... a speaker-output on a 2-way radio, or a cellphone headphone jack turned up loud... it will NOT trip with a 1000 ohm 1v signal very reliably.But very easy to set up... and extremely inexpensive.
Andrew
2025-08-15 16:30:55
Device itself works fine, but zero product support or manual. You'd think that it would come with at least some kind of paperwork, but it did not. That being said, some internet searching will provide you with lots more info. There are also pins that you'll have to solder if you want to take advantage of the different modes the chip offers. Not a big deal, once you finally find a manual to tell you whats what.Aside from the extra work you have to do to figure out how to make it do what it's supposed to do, it's a well made circuit and product overall.
George T.
2025-05-22 14:08:03
I purchased two units, both work as advertised. fast shipping. Easy to interface and easy to use. Highly recommended!
Michael A Street
2025-02-17 14:11:52
The AD22B04 12V 4 Channel DTMF Tone Signal Decoder Relay Phone Remote Control PLC is a nice compact board at a reasonable price. I down loaded programming and instruction sheets. The first unit I got failed out of the box, so I requested and promptly received a replacement. After inputting DTMF tone transmitted via a pair of amateur transceivers, it still didn't work as expected. So my next step is to return it
Customer
2025-01-24 11:13:17
If it included just a single sheet of paper with installation instructions and programming info, this may be a great product. However nothing like this was included and there is no link to this info on the Amazon sales ad. Somebody posted a YouTube video in the q&a section but that does not go over programming, only default usage. I understand that pressing one two three or four on the phone keypad are the default settings, but there is no instructions on programming your own codes.
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