# 80-005

Stairway to Heaven game kit

# 80-007

RIAA Equalized Preamplifier kit, or preamp

# 80-010

Three Digit Counter Module

# 80-013

Infrared Beam Door Minder (an alarm, may be used with a counter)

# 80-014

Music Box Engine (Light activated)

# 80-020

LCD Temperature Meter (Celsius electronic thermometer)

# 80-030

LED Dice with slow down (game)

# 80-035

PLL Experimenter Kit (Phase-locked loop kit)

# 80-040

Introduction to a Power Supply

# 80-043

PC Board mounted RELAY

# 80-045

R.F. Amplifier Kit

# 80-046

Flashing Star Kit

# 80-050

44 Watt Stereo Power Amplifier Kit (audio amplifier)

# 80-005, Stairway to Heaven Game Kit

Pressing the switch while a dual LED is green advances you to the next stage; but mess-up and press while red, and you go back to the beginning. It can be tricky and a challenge. Fun and teaches some practical basic electronics. Operates on 9V battery.

# 80-007, RIAA Equalized Preamplifier Stereo Kit 
The grooves in phonograph records could not handle the deep bass and high treble in live music. The industry developed a standard recording curve and the missing sounds were compensated for by circuitry in playback preamplifiers. The R.I.A.A. (recording industry Association of America) set the standard for the "RIAA curve". Today amplifiers are designed for flat response and they make the old phonograph recordings sound very flat. Using an RIAA preamplifier compensates for today's flat amplifiers exactly as the old phonographs were able to do. This kit duplicates the RIAA curve accurately; at a kit price. Operation on 9 to 12 V. DC.

# 80-010, Three Digit Counter Module Kit

An event counter; this economical counter module may be ganged for six or nine digits. Has count and reset switches with debounce built-in. Operates on a nine volt battery. This is a two board kit with the count and reset switches along with the debounce circuitry on one board, the LED digits and circuit on another.

# 80-013, Infrared Beam Door Minder Kit

A transmitter sends an I/R beam up to 75 feet to a receiver (on separate pc boards); break the beam and a relay is tripped. Use the relay to control a bell or light or other device, even a video recorder and camera. Operation requires 9 to 12 VDC, a wall adaptor is fine and you may want two units (provision is made to power both boards with one supply via a two conductor wire). Use to watch a hallway or drive way, across the doors to a three or four car garage etc. and we know of a photographer taking wildlife photos this way. The uses for alarms, photography, door minding and so on are numerous. You could make weatherproof hoods to use out-of-doors but be sure to protect from moisture.

# 80-014, Music Box Engine, Light Activated Kit

This circuit will play a tune when light strikes a light dependent resistor, such as when a music box lid is opened. You can select any one of about a dozen romantic melodies; play just one or let the unit cycle through all of the tunes. Operates on 3V DC, two AA cell holder included. You could really wow a girl friend or simply please your mom.

Note that we did not have a finished kit photo so we inserted a photo of just the PC board; the kit will include all parts, of course.

# 80-020, LCD Temperature Meter (Celsius Only) Kit

Designed around a single IC, the Harris # 7106, is this temperature meter with excellent accuracy. All parts needed, even a case, are included except a 9volt transistor battery. Instructions also explain how to use this kit to make a volt or amp meter in various ranges. The circuit board has room for additional components if you use it to make a digital panel meter.

# 80-030, LED Dice with Slow-Down Kit

This is an excellent kit for use as an introduction to electronics and circuit analysis. Seven LED’s arranged like a real die face. Push the switch and the die rolls and then slows down and then stops. Uses an ingenious circuit design to minimize parts count. Uses a 555 and 14017 integrated circuits. Includes plastic case; battery operation.

# 80-035, PLL Experimenter Kit from kHz to 185mHz (Phase Locked Loop)

An exciting circuit, the PLL Experimenter kit may be used for making a stable AM or FM transmitter, a Signal Generator (from low kHz to about 185mHz), a QRP Ham transmitter, circuit diagrams for all of these are included. What you get is a very high quality PLL circuit module, with touch-tone style keyboard (to set frequency) and you will have to add the components for the circuits mentioned above. Crystals can be expensive; here is the answer. Not a beginner’s kit; intended for the serious experimenter, Hams or very advanced beginner. Operation from 8 to 12V DC; a nine volt battery is ideal. Fine tuning in 10 kHz steps. Extra room on board for added components. This circuit is really worth having!

# 80-040, Introduction to Power Supply Kit (Practical Hobbyist Power Supply)

A practical battery eliminator for circuit projects at the bench. This is a basic power supply using two IC’s (7805) regulators. User needs to supply a transformer up to 20V AC for input (we suggest scrounging from old radio or surplus catalog). Outputs are regulated, one variable up to 28 volts and one constant 5V DC. A good introduction to power supplies.

# 80-043 Relay kit with 12 volt, ten amp relay, PC board and hardware

# 12-605 Blank boards, Package of two, photo to your left

The output of many circuits has an alarm signal, which must be connected to a remote switching device. Or, sometimes you will have a kit to test, which needs a relay connected to it. For this purpose, this kit is perfect. A 12volt (coil) relay mounts on the PC board, which includes a protective diode and terminal blocks. The terminal blocks make for fast, easy screw-connection of wires to the coil and to the contacts. If you prefer a different relay coil voltage, the boards are available separately. Either use Philmore TB132, TB133 terminals or solder to the board. Board accommodates any relay from 3V to 24V coils (all ten amp contacts).

# 80-045 R.F. Amp Kit

A small circuit, using the Mar-6 Amplifier IC, this kit will provide as much as 20 db gain. Connect at receiving antenna input; will boost signals from 1 MHz to 1000mHz; two RF amplifier kits may be cascaded for even greater gain. Instructions tell how to substitute a couple of capacitors for use at low, broadcast-band frequencies. Use with Scanners, Ham receivers, SWL receiver etc. You could add a metal case and RF connectors for permanent use. May be used to boost signal for ‘scope or frequency counter as well.

# 80-046 Programmable Flashing Star Kit

Uses the ATMEL AT89C2051 microcontroller, which comes already programmed with a clever and complex display pattern. The 30 LED’s follow each other about and finally flash and hold the star pattern for a moment. Or, you can download software (free) to set up your own pattern. Place in a window or on top of a Xmas tree; the super-bright LED’s produce a very spirited holiday feeling. This is excellent micro-controller learning Kit with full explanation of how the device works and drives the 30 LED’s. Operate with a wall adaptor at 9 volts and about 150 milliamps (maximum). A very nice kit.

# 80-050, 44 Watt Stereo Power Amplifier (audio amplifier) Kit

The circuit is a gem; a TDA1554 IC is the heart of an amplifier that will output up to 22 watts per channel with excellent sound quality. (Typical THD less than 0.1%!). Originally intended for automobile use, but can be used as a home amplifier if you have a good power supply. Operates on 13 to 14.4 volts (typical automobile voltages with engine on) and can draw as much as five amps at 13.8 V DC.