- LCD Temperature Meter
Introduces 3 1/2 digit LCD and the very popular 7106 IC. This IC has been used in low-cost multimeters for over 13 years. We use it to measure temperature using a ordinary signal transistor as the sensor. Data sheets are provided as is a breadboard area so you can extend the circuit to build your own voltmeter, ammeter, resistance meter or extended-range temperature meter. Takes away the mystery of how multimeters work. Box provided. 9V battery operation.
- Opamp Function Generator
Cheap and simple circuit to generate square, (pseudo) sine and triangle waveforms in the audio range. Uses quad opamp LM348.
- Logic Probe
A logic probe is one of the most important pieces of equipment for testing digital circuits. Apart from fault finding testing it can also assist in design work and to find out how digital equipment works. Switch for either TTL or CMOS. Includes detection circuit for very fast pulses. Gives visual (3 LEDs) and audio (piezo buzzer) response.
- 3 1/2 Digit LCD Panel Meter
Make this general purpose 3 1/2 digit LCD panel meter into your own voltage or current meter or custom-make it to measure voltage input from a transducer. Full details are given in the documentation. Uses the very popular 7106 IC. The LCD section of the PCB may be cut off and mounted separately.
- 3 1/2 Digit LED Panel Meter
Make this general design 3 1/2 digit LED panel meter into your own voltage or current meter. Or customize it to measure input from a transducer. Full details given in the documentation. Separate display PCB. Uses 7107 IC.
- Stereo VU Meter
A simple, low cost stereo VU meter. Two LM3915 dot/bar display driver ICs are used to drive 2 rows of 10 LEDs (4 green, 3 yellow, 3 red) in a moving bar display. Each row of LEDs spans a power range of 0-30 dB in ten 3-dB steps. This VU meter indicates "peak music power" when used with audio amplifiers. Ideal add-on for any of the amplifier kits. Dimensions = 65mm x 42mm
- Continuity Tester
A continuity tester is one of the most useful pieces of test equipment to have. It is used for testing the electrical continuity between two points. Our tester will "buzz" within two ranges - LO up to 3 ohms and HI up to 185 ohms. Ranges adjustable by simply changing two resistors. All details and analysis of how it works so you can vary to suit yourself. Uses LM324 quad op-amp and external drive piezo element. All components mounted on PCB. Requires 9V battery.
- Simple Square Wave Oscillator
This simple kit, based on the popular 555 timer IC, generates six preset frequencies - 1Hz, 10Hz, 100Hz, 1KHz, 10KHz and 100KHz. The output is selected by setting a jumper position. It has a wide operating voltage (5-18V) and even provides visual indication (LED) of the output. A 9V battery snap is provided and a suitable mounting box supplied.
K168 - Ultrasonic Wind Speed Meter
A 'no moving parts' wind speed meter using the Doppler Effect between two 40kHz ultrasonic transducers. Uses a 2x16 LCD and PIC16F628 microcontroller (source code here). As published in the UK electronics magazine Everyday Practical Electronics, January 2003 - click here for article.