PA LNA TRX TRCVR RF Relay Sequencer, 4 ports/3 events

RF Relay Sequencer


Event sequencer for proper RX to TX transmition, and the return to RX mode. This sequencer based on modern STM32F0 CPU. Internal CPU clocking guarantees high precision and long-term stability, no capacitors, no external timing network, everything is digital. Sequencer has four high current MOSFET switches on output, they switching in 3 step (stage) with delay. Delay time can be selected by onboard jumper from two values - 15ms or 45ms.Three of MOSFET output port is "OPEN DRAIN" and "ground" active - OUT1, OUT2 and OUT3. Fourth MOSFET output port has external DC +12-30 input line (IN+) that switched ON (to OUT+ line) in TX mode and has same timing diagram as OUT3.

Output ports not protected, just bare DRAINS, so - be carefull, don't forget to use diodes in parallel with relay coils.

Sequencer can be switched to TX or RX mode by external footswitch only (active state - ground).



* Board size is 70 x 45 mm

* Output ports: 4 ports, 50v/3a max

* Input ports: Footswitch (active state - ground)

* Delay time: 15 ms or 45 ms, onboard jumper selectable

* DC input: 5-12VDC, >0.1A


You will get soldered and tested PCB with uploaded firmware.

Before publishing review are moderated