In article .com,
"stefanhanoi" wrote:

Hi,

I've got a working Echopilot 550, produced by Incastec Associates Ltd.
It features a rotating LED handle, like the old Seafarer models. Depth
range is 0-12/24/120m.
Incastec seems to have supplied Seafarer with Sensors.

I'd like to have the output in another form, e.g. voltage (or pulse
width, or frequency) corresponding to depth, so that I can easily
monitor it remotely, or feed to a PC system.

Does anybody have schematics of that Echopilot 550 (or the old
Seafarers which seem to work similarly), so that I could draw up a
converter - if somebody else hasn't done that already ...

TIA,
Stefan


You can look at the output of that sounder as if it were an A-Scope
with any osciliscope. You get the Main Bang of the Transmitter and then
the amplified echo of the bottom, fish, whatever, coming at some time
(milliseconds) later. That could be feed into a Schmitt Trigger and
then presented to a digital input port and timed for depth.


Me who used to do that many years ago............