This DTMF remote controller uses popular MT8870 or equvi DTMF decoder IC. Detection of DTMF input is very stable. The circuit uses Binary output to control all four relays in various Binary combinations. One or choice of multiple relays can be turned on using number 0 to 9 at input. Next control digit changes the relay status for new command. Relay/s remain latched until next command is received or power reset is used. Start to control AC/DC devices upto 250V within minutes as relays are provided ready to use with connectors.
Status Indications for all relays, power-on and DTMF signal receive status are available through LEDs
- Two DTMF input connectors - Audio jack as well as two point terminal
- 12V power supply jack for easy power connection
- Power on LED indicators, DTMF signal LED and 4 LEDs for Relay on/off status
- High Quality FR4 PCBs
- Quick despatch with tracking ID
Easy, quick assembly of kit by component placement diagram using labelled components and parts list. Parts number printed on PCB with polarity.
Designed and tested by experienced HAMs