BUILD AN ELECTRONIC CHIME OR PERCUSSION RELAY
FOR YOUR PIPE ORGAN
By John DeMajo
With the popularity of electronic organ relays, it often becomes necessary to
devise a means of switching higher current devices, such as chime or electric
percussion solenoids, throught a relay output designed to handle low current.
Most organ relays are designed to operate chest magnets in the range of 100-150
ohms at 12VDC. A chime relay, however, can routinely draw 1 to 2 amps. This
simple circuit, consisting of only four parts per single note unit, can be constructed
for around $2.50 per contact. Built with standard components available at Radio
Shack stores, the device works as well as the more expensive Peterson and Sindyne
|Above, circuit diagram and description. Note that LED and resistor are
optional and serve only as indicators that a particular note is in the activated
state. Below, a group of nine repetetive circuits can fit on a standard
PC board available from Radio Shack.
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