# 80-100 Touch (Contact) Switch Kit

Both a touch and a contact switch are built onto one PC board so that the builder can see how each works. A battery can power the contact switch but you’ll need an AC power supply for the touch switch to work well (use No. 80-040) for reasons explained with the kit. The circuit is triggered by AC "hum", so use a wall wart power supply for best result.) The circuit switches a relay with a 3 amp, 110 volt rating. Use to switch lamps, other appliances.

# 80-101, Home/Car Alarm Kit

This circuit is an alarm for the home or car door, and a lot more. It employs a magnet and reed switch to trigger the circuit; when the magnet is moved away from the reed switch, the alarm is triggered.  An integral piezo sounder produces the alarm sound (100dB). And a PLUS, a relay capable of handling up to 10 amps AC is included and may be connected to turn on or off an appliance, light or external alarm sounder etc. Therefore the circuit could be used to turn on a light whenever a basement or garage door is opened.

# 80-102, Universal Timer Kit

Set timer for anywhere from a few seconds to about 15 minutes, control AC appliances; it will beep and trigger a relay when it has timed down. May be used for darkroom or PC board exposure timer, exit room timer etc. Turn anything on or off. The ten amp relay can switch some larger loads such as bright lights, small AC motors etc. The circuit operates from 9volt transistor battery.

# 80-103, Photo Sensor with Control Relay Kit

The most popular usage for this kit is to make your own nightlight; and you won't be limited to one of those dinky seven-watt bulbs. You could also switch just about any appliance either, on or off, with either darkness or daylight. Light sensitivity is adjustable over quite a range. The relay can handle up to 10 amps AC. You need to add a 9volt transistor battery or a nine volt, 25 mA supply.

# 80-104, Stereo Preamplifier Kit

Amplify any tiny audio signals about fifty times, and deliver them to a power amplifier cleanly and undistorted. An AGC (automatic gain control) eliminates pops or distortion. This circuit will be useful in boosting the output from tape heads, microphones or a magnetic phono cartridge etc. The fidelity is very good; use for input to an audio amplifier. Requires a 12V DC power supply at about 100 mA peak.

# 80-105 Voice Changer Kit

Your voice can be changed to add a vibration, like those used to disguise secret witnesses. Or, you may change your voice tone upward or downward; women sound like men and vice versa. Includes a very ROBOTIC voice as well. A microphone and speaker are included on the PC board; all that you need to add is a 9volt, transistor battery. This is a very novel and entertaining circuit.

# 80-106, Sound Effects Generator Kit

Another novel circuit that might be useful for special theatrical effects. Or, if you are simply a practical joker. The circuit can produce sounds such as the tick-tock of a grand father’s clock, a heart monitor (as in the hospital), water on a tin roof, a motorboat, cricket, etc. Requires a 9volt battery. Includes its own speaker.

# 80-108, Serial Port Relay Module Kit (or, serial port relay board. Control up to eight relays with your PC)

Added in response to the popularity of our part no. 80-740, which is for use at the parallel port. This programmable set of eight relays and connects to the serial port of a PC. This permits location at some distance from the PC (up to about 100 yards away), plus the circuit may be disconnected from the PC once it has been programmed. Latched relay operation, 250V / 12A certified relays switched (250V rated) and with 4 external inputs. Programmable. Comes with case and end panel pieces as shown in photos.

# 80-109, Unipolar Stepper Motor Driver Kit

Only a photo of the PC board was available at press time; but all component parts are included.

A stepper may be used to orient a video camera, antenna, spotlight etc. or used for table position in production. This driver will control a 5, 6 or 8 lead unipolar stepper motor (often available from surplus dealers). The circuit permits fast or slow run rate and even single stepping into final position; uses the UCN5804B IC. Four LED’s indicate movement if motor is remotely controlled (input from 6 to 35 volts). The kit is supplied with quite a bit of good information, how to identify motor connections, spec sheets and a list of references for reading about steppers etc.

# 80-110, Continuity Tester Kit (photo shows board only)

This is the most often needed piece of test equipment, checks continuity at two, switchable settings: 2.8 or 185 ohms. The unit will buzz when continuity below the set resistance is encountered. Based around the LM324 op-amp IC. This kit is wonderful for beginners that need to learn to solder, identify components and finally end up with a basic test equipment circuit that will be useful as they continue their education. (Shown to left, the PC board only; the kit includes all parts except a 9volt battery).

# 80-111, Square Wave Oscillator Kit (photo shows board only)

This is a very simple circuit, generating square waves for use with test equipment, teaching, etc. Generates square waves of approximately 1Hz, 10Hz, 100Hz, 1KHz, 10KHz, & 100KHz. This is a good teaching aid kit, both for the instructor and the DIY user.

# 80-112, Pocket Sampler/Data Logger for PC Kit (photo shows board only)

The circuit is a PC driven sampler that monitors voltage changes over periods ranging from milliseconds to months. It can even double as a low frequency "scope", to examine signals up to about 5KHz. Powered by connection to the parallel port, no external supply needed. This kit is designed based upon original article in Electronics Australia, (Aug. ‘96) by Graham Cattley. The original article is included, full of useful information and applications. Here is a place to put that old ‘386 or ‘486 to use. Software is included; runs under DOS. The entire circuit fits in a compact plastic connector case, included. A good kit for serious hobbyists.

# 80-113, PC Dual Stepper Motor Controller Kit (photo shows board only)

The kit enables user to control two unipolar stepper motors via the parallel port. Four digital inputs are also included (these may be used  for monitoring external switches, inputs etc.). The kit does not require a power supply. Included, an extended D-shell plastic case (RS-232 style) and all parts. A DOS based program written specifically to drive ‘steppers’ is included on diskette, complete with C source code.