You can strap the TT-7 for detection of any single digit, including the secondary A, B, C, D digits. When the decoder detects the selected digit, it will provide a closure to ground for driving a relay, lamp, sounder, or other such load of up to 20 mA. A commercial central office quality decoder IC chip is used, making the TT-7 extremely reliable, fast and sensitive. You may connect the TT-7 directly across the speaker or detector output on any receiver, and in fact, we even detail how it may be connected directly to a telephone line. We designed the TT-7 to be small enough (about 2 square inches) to fit in many radios for easy installation. If your needs are simply single function remote tone control, the TT-7 is for you. (For multifunction remote control, use our TG2 Tone Grabber). Runs on 5VDC. Size: 1 1/2" x 7/8" x 2 1/4".
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