[The pictures I attached at the time have gone missing since the move to the new forum format.]
Thanks for the tips on making a remote...
If I've done it right, there should be a couple of pictures of my concoction below. I've based it on the HIRK-433 Hybrid Receiver module (N87BN) and 3-button key fob (RN57M) from Maplin. I've used opto-isolators (CY94C) rather than relays to trigger the remote inputs on the FatFrog (thanks Paul for the necessary electrical info). It's powered from the desk lamp socket (using a 7805 voltage regulator circuit inside the remote unit) and by modifying an XLRM-F adaptor from CPC (CN00111) the desk lamp can be mounted at the same time the remote unit is plugged in. With output and 'thru' locking DIN8 sockets for the remote connection to the FatFrog, as they say, job's-a-good-'un!
By setting up the first three remote switches as 'go next', 'go 1' and 'go --' whilst focusing (on my own - sigh!) at the other end of the hall on top of a scaffold tower I can step through preset memories, return to the first or go to DBO without having to climb up and down the scaffold and walk back to the desk for each lantern!
Parts List (4-channel unit):
("e.g." if I already had the component in my bits box, but I've suggested a suitable part)
1x HIRK-433 Hybrid Rx module (Maplin N87BN)
1x 3-button key fob (Maplin RN57M)
1x Flexi antenna (Maplin LL80B)
4x SFH618-2 opto isolator (Maplin CY94C)
4x 150 ohm resistor (Maplin M150R) [in series with opto anodes]
4x 100 ohm resistor (Maplin M100R) [in series with opto isolator collector]
1x Push switch (Maplin FH91Y) [Learn]
4x Green LED 5mm (e.g Maplin WL28F) [channel indication]
1x Red LED 5mm (e.g Maplin WL27E) [power]
1x 220 ohm resistor (Maplin M220R) [in series with Power LED]
1x Yellow LED 5mm (e.g. Maplin WL30H) [status]
6x 5mm LED clips (e.g Maplin YY40T)
1x DIP2 PCB switch [optional: Link1/Link2 configuration]
5x 0 ohm links (or bits of resistor leg!)
For the power supply part of the circuit (preceeded by a bridge rectifier as I wasn't convinced the Desk Lamp output would be DC!)
1x 7805 Voltage regulator (e.g Maplin CH35Q)
2x 100nF ceramic capacitor
1x 22uF 63V electrolytic capacitor
1x 47uF 16V electrolytic capacitor
1x Bridge Rectifier (I used RS 261-328 but any would do!) (e.g. Maplin AQ94C)
2x 1nF ceramic capacitor [decoupling of HIRK-433 analogue and digital supplies]
1x 4.7uF 16V electrolytic capacitor [decoupling of HIRK-433 digital supply]
I also used an in-line 100mA fuse.
1x XLR3M chassis plug (e.g. Maplin BW92A)
2x Locking DIN8 sockets (CPC CN00765)
2x 8-pin PCB headers [remote connections]
9x 2-pin PCB headers [LEDs, switches etc]
1x 1-pin header [aerial connection]
1x ABS project box 120mm x 100mm x 45mm (Maplin LH22Y)
7/0.2 and/or strips of rainbow ribbon cable for wiring up LEDs, switches etc
heat-shrink tubing
M3 and M4 screws, nuts, washers, spacers
solder!
To make an 8-pin 'standard analogue control cable' for connection between remote unit and FatFrog remote input:
2x Locking DIN8 in-line plugs (CPC CN00753)
8-core cable (e.g. CAT5 ethernet cable)
To make a power cable from FatFrog desk lamp socket:
1x XLR3M-XLR3F (CPC CN00111) [drilled in the centre to take a piece of 2-core cable]
1x XLR3F in-line plug
2 core flexible cable
I made my own single-sided PCB using dry transfers onto a piece of Maplin WF38R and using WF10L etching fluid. (Scale pdf of the layout attached to this post.)
[As per the original poster, you use this information at your own risk! (But mine works nicely!)]