= 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

Project Info

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]

STATUS CODES

f	failed
g	device not complete
n	not tested
p	planned
q	not accomplished
r	resigned
u	fully operational
w	assembled but not tested
x	not avalaible (returned, sold, lost or no data)
z	decomissioned (disassembled)

Prefix 17

HF Register

Microcontrollers in my contructions and external equipment

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