K2
- 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.
K23
- Opamp Function Generator 
Cheap and simple circuit to
generate square, (pseudo) sine and triangle waveforms in the audio
range. Uses quad opamp LM348.
K61
- 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.
K89
- 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
K111 - 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.