K13
- Sound Activated Tape Recorder Switch 
Can be adjusted to turn on
your tape recorder through its REMOTE plug. Has feedback and delay
circuit for robust operation. Very sensitive. Proven circuit. Needs 6V
plug pack for most stable operation.
K21
- Two Station Intercom 
Simple two wire intercom.
Each unit with its own speaker, microphone and amplifier (LM386.) Can
be modified to a hard wired "bug". With 4 strand ribbon cable the
power can be sent to the remote "bug" unit from the receiving unit.
K26
- Fibre Optic Audio Link
Allows you to send sound
through plastic 1mm fibre optic cable. Matched transmitter/receiver
pair. Two circuit boards with a microphone at one end and a speaker at
the other. 14 feet of fibre optic cable supplied. Will work over 200
meters.
K30
- PIR Movement Detector 
Circuit designed around a
recently developed movement IC. Circuit utilizes PIR detector and a
light dependent resistor (LDR) to provide an optimized circuit that
will detect motion up to 6 metres away. Operates on 9-12 VDC. Note
that the PIR sensor & the PCB-mounted fresnel lens fit on the
other side of the PCB; the solder side. This is to allow the unit to
be mounted inside a container with the detecting lens poking out and
the controls facing inside the box.
K33
- Tape Recorder Switch for Telephone 
This kit uses a FET to switch
on a tape recorder when the phone is picked up. It will work with low
voltage tape recorders as low as 1.5V. It requires the REMOTE &
MIC jacks of the tape recorder to be available. Plugs are provided.
K76
- PIR module, cable connection, (assembled), KC7783 
A fully assembled and tested
miniature PIR module with only 3 connections: Power, Ground &
Output. Rated for 5 - 10VDC input power. Has 2 1/2" cable attached as
shown in the photo. Uses RE200B PIR sensor (datasheet page 1, page
2), KC778B movement detector IC
(datasheet
page 1, page
2) and PCB mounted Fresnel lens. Output is an active high pulse of approx. 0.5 seconds and
remains active as long as there is motion. Range up to 3 metres.
Sensitivity is fixed. Small size, 25 x 35mm (1" x 1.35").
