This light barrier uses the IC U2531B and works with invisible infrared light beams. Transmitter and receiver included! Ideal for alarm systems, automatical animal picturing, remote control for garage doors, etc. With incorporated infrared filter for day operation!
The matter is to pass a small wire loop through a thread wire with a lot of bends and obstacles. The person who touches the thread wire with the wire loop, will release an acoustic and optic signal. An interesting game for parties and for never-ending evenings.
When installing into a hemispherical reflector (e.g. a plastic ball divided in halves) this highly sensitive microphone is able to record noises and speech from a distance of several hundred meters. Ideal for observing animals, for detectives, etc.
The converter makes it feasible to receive, for example, taxi radio, amateur radio, marine radio broadcasting, television sound, etc. through an ordinary FM-radio. The converter has simply to be placed within the antenna lead!
Adjustable time switch for switching operations from approx. 1 sec. to approx. 40 minutes. The device switches on after pressing the key and switches off again when the adjusted time has expired. The lapse of time may be interrupted any time with the reset key.
For testing highly resistive and low impedance connections. An extremely low holding-wire current flows (< 10 µA). If the connection is conductive, the piezo buzzer hums. Also usable as rain indicator when the test probes contact water!
Easy instructional kit for beginners ages 8 and up. The cables are not to be soldered, only screwed or twisted. The experiments are explained through illustrations and helpful descriptions. A 4.5 V - flat battery (not included) serves as current source.
Electronic flasher unit for glow lamps. Also suitable as alternating flasher. Flashing frequency: approx. 1 - 3 x per second. Ideal for usage within miniature constructing! Together with the additional kit B197 is feasible to operate flashers with loads up to 3A current consumption!
This generator produces ultrasonic sounds, which are adjustable within the range of approx. 8 - 35 kHz. It is said, that crawling and jumping parasites are banished through the ultrasonic sound. Frequency can be adjusted so that the domestic animal will not be disturbed.
With the aid of this circuitry it is made possible to carry out functional tests of infrared remote controls used in TV-sets and video devices, etc. Whenever there is radiation of infrared beams on the Special-Sensor, the LED will light up and indicate that the infrared remote control is operated.
This relay card could be released with weak signals from approx. 5mA upwards and will then switch a relay with a heavy current contact of 3A. Ideal as switching amplifier for other kits, which have solely a light emitting diode as output and should switch other devices and machines through the relay contact.
With the enclosed optics and highly sensitive photodetector this light barrier has a max. range of up to 50 m! The infrared light ray is invisible for men. If the light ray between the transmitter and receiver is interrupted (if a person walks through it) the relay in the receiver switches.
An LED lights up if a body approaches the ultrasonic sensors at a distance of 10 - 80 cm (depending on the size of the body). Use: parking-in assistance for cars in garages, alarm signal for persons or animals staying in a certain area.
With the infrared spotlight CCD- and video cameras may recognize objects also in complete darkness. The infrared light is invisible for men, CCD-cameras can see well with an infrared spotlight. Perfect for inconspicuous observation of entrances, drives etc.
After releasing the push-button, the light signal rotates quickly at the 10 LEDs, slows down and then stops at random at one of the LEDs. During operation all LEDs shine except that LED that just receives the signal. That's why the luminous board looks very decorative.
This device produces a high ultrasonic sound (approx. 23 kHz). Martens, mice, etc. find this sound extremely annoying and these animals will leave that place (most). Ideal for installation into cars (as protection against martens), in houses against mice, etc