= HF8V = / = SP8WJT = / = SP0106RZ =
HF-17828
PROJECT: HF-17828
DESCRIPTION: 4 Channel DTMF tranceivers MIKROTEL SP0205_4 (4xMT8888)
BRAND: MIROTEL
STATUS: u
PROJECT START DATE: near 2018
LOCALISATION: DD
DOCUMENTATION:
PCB: TPD57828
DIMENSIONS: 188 x 37 mm
VERSION: 1.00
HF-17828
I made some basic tests with this module. One XTAL 3.579 MHz is used to clock all 4 MT8870 tranceivers.
Components:
| IC | COUNT | DESCRIPTION | REMARKS |
|---|
| MT8888 | 4 | DTMF tranceiver | |
| 324 | 1 | OP AMP | |
| 74HC138 | 1 | Demux | choosing channel |
| 7805 | 1 | Regulator +5V | |
Similiar module with MT8870 DTMF decoders was catalogued as HF-17380
Sources:
[1] MT8888 Application Note
[2]
Prefix 17
HF Register
Microcontrollers in my contructions and external equipment
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