http://www.radioworld.com/columns-and-v ... ems/337098Wayne Kirkwood shares some time-saving kits from Velleman. Though we could design and build these widgets ourselves, many of us simply do not have the time.
The Velleman K8015 is a multifunction relay kit with adjustable delay.
The K8042 is a symmetric or bipolar power supply.
Velleman’s VM201 Ethernet relay card can be controlled by a smartphone.