I have started migrating content to my Hugo blog at https://blog.cavelab.dev, already migrated pages will redirect there.

Relay box for strobe lamp

From CaveLab
This page is kept for historical interest. It may document projects or methods that are obsolete and/or no longer relevant. The information here is not kept up-to-date.

I built this module for Sensonor ASA back in 2008, I have no idea if it is alive today.
Relay box for strobe lamp

Simple relay box with 5V input, used for 24V strobe lamp.


This relay box is used for a temperature alarm at Sensonor. The trigger signal is sent from a AKCP SensorProbe2, which is a email based warning system for e.g. temperature and humidity. The strobe is placed in the production area.

Connector RJ-45

AKCP SensorProbe2 connection:

Akcp relay wiring diagram.PNG

The Data output needs to be amplified using a NPN transistor. The relay is connected between the +5V and transistor output.


Schematic drawing

Releboks for blitzlampe circuit.png

Parts list

Qty. Part
1 × Diode, rectifier, 1 A, 400V, 1N4004
1 × Enclosure, plastic (waterproof), 70x50x65mm, clear
1 × Fuse 5x20 mm, 800 mA, fast-acting
1 × Fuse holder, open, PCB, 5x20mm
1 × Fuse holder, open, PCB, Protective cover
1 × LED 5mm coloured clear, Green, 2.1V, 20mA, 30mcd, 10°
1 × LED 5mm coloured clear, Red, 2.1V, 20mA, 8mcd, 10°
32 cm2 PCB, stripboard, 100x160mm, 160cm2
1 × Power jack, panel, 2.1mm, plastic housing
1 × Relay, 2 CO, HJR1-2C, 5 VDC, 1A 120V, PCB
2 × Resistor, metal film, 0.6W, 2.2 kΩ, 1%
2 × Spring-loaded terminal block, PCB, 0,5 mm2
2 × Terminal block, PCB, screw, 5mm 2-pin