The active material is enclosed in metal foil fixed in a cylindrical mount provided with a stem of 4mm diameter. 
The foil is further protected from accidental damage by a wire gauze cap over the open window’ of the mount.
The nature and strength of each source is clearly engraved on its mount and it is also colour coded for identification. 
Emissions: β
Half-life:28 years (strontium), 64 hours (yttrium)
Colour code: Yellow
Each is supplied in a small lead castle’ in a suitably labelled MDF storage box 100 x 75 x 65mm high. 
A data sheet is enclosed with each.
5μCi (185 kBq) of Strontium90 in equilibrium with its daughter nuclide Yttrium90, incorporated in a silver disc allowing the major proportion of the Beta radiation to escape.

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This laser emits an intense monochromatic red beam of wavelength 630 - 640nm at 0.9mW (Class II operation).
The laser beam can be modulated by applying an external digital or analogue waveform to the 3.5mm jack socket on the rear panel. 
Typical beam divergence is approximately 1 millirad.
This allows speed of light experiments to be easily performed.
Alternatively the beam can be modulated by the internal generator which produces 0.1µs pulses at approximately 1MHz. 

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The Function Generator has many versatile functions. Wave Shape Output : Sine, Square, Triangular, Pulse & TTL/CMOS Compatible Square Wave Output Freq. Output : 1 Hz - 100KHz (adjustable) in five steps 1Hz, 10Hz, 100Hz, 1KHz, 10KHz with multiplier x 10 Coarse & Fine Amplitude control settings are provided at the front panel. 
PULSE, TTL/CMOS Sine/Square/Triangular all the three outputs are available at a time on the front panel & can be used simultaneously.
Input Voltage: 120V, 60Hz & 240V, 50Hz/60Hz (Selectable).
PULSE & TTL/CMOS output, amplitude in the fixed compatible to TTL/CMOS series.
VCO (Voltage Controlled Oscillator) : In this mode the o/p frequency available is corresponding to the DC Voltage applied at the VCO IN (0.1V to 10V) socket & putting the toggle switch in external mode.
Dimensions: 215 x 180 x 130 mm (W x D x H)
Weight: 1.5 Kg approx.

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The Signal generator is a robust instrument and can withstand prolonged short circuit for the output. 
The earth provided is connected to the physical earth through the power cord; the signal generator output is floating with respect to ground.
Do not open the unit as this will make your warranty void.

Technical Specifications :
Frequency Range: 0.1 Hz to 99.9 KHz in six decades, read on digital display.
Frequency Accuracy: 0.01% (100 ppm) in all ranges
Output waveform: Sine, Rectangular and Triangular 
Maximum Power output of 4.5W available over the entire frequency range for all waveforms.
Maximum Power Transfer occurs when the load is 4ñ, giving 62/(4+4) = 4.5W
High Impedance Output: Maximum 17V peak to peak from internal source impedance of 600ñ
Low Impedance output: 6V R.M.S. at 4ñ (about 8.8V peak for all waveforms)
Amplitude Control: Variable from zero to maximum output in 256 increments, amplitude is displayed by a 10 segment bar graph
Attenuation: x1, x 0.1, x0.01, ±1%, operating only on the 600ñ output.
Amplifier voltage gain: 100
Frequency Response: DC to 100KHz, -3 dB, output power 4.5W into 4ñ load 
Controls : All control settings except amplitude are stored and updated upon any changes.
Electric Supply: 220V~240V, 50Hz
Dimensions: approx. 210mm x155mm x 118mm L X W x D
Weight: Approx. 2.05kg , without power cord
Internal fuse is T315mA L.

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Simple Circuit Modules :
Buzzer
A low current buzzer of 2mA approx. capacity.
On base. 
LED Boards
Large light emitting diodes with series resistor of
220ohms for p.d's of upto 6V.

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Simple Circuit Modules :
Lamp Holder
4.5V / 0.3A bulb in a holder.
LED Boards
Large light emitting diodes with series resistor of
220ohms for p.d's of upto 6V.

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Simple Circuit Modules:
Reed Relay
The reed contacts are protected from short circuit damaged by series resistor.
A current through the coil produces magnetism to cause
the reed to switch another circuit

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A smoothing unit for reducing ripple from non-regulated power supplies. 
The unit comprises a lightweight and efficient toroidal 0.1H inductor with a network of 2,200uF capacitors and diodes. 
Maintains a ripple-free output when high currents are drawn. 
Up to 8A at 35V, absolute maximum 40V d.c. (d.c. rectified from 28V a.c). 
With a supply of 12V at 3A, 1% ripple would be typical. 
Will work without suffering damage even at reverse polarity. 
Shrouded sockets accept standard 4mm plugs and shrouded plugs.

Technical Specifications :
Input Voltage: 0 to 35V, Absolute maximum 40V
Current rating: 8A maximum
Height including handle is 187mm.
Dimensions: 208 x 155 x 115mm (W x H x D).

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