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Description |
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Price
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| 555LABO | Light alarm 555 buzzer output.
Based around the versatile 555 timer ic, will produce a waveform to feed the on-board piezoelectric sounder when light reaches a certain level. |  | 5 |
| 555LASO | Liquid alarm 555 sounder output.
Based around the 555 timer ic, will give an audible alarm when liquid is sensed, e.g. rainfall, basement flood water. A stripboard for a sensor is ordered separately , (order code LSS). | | 5 |
| 555MS | 555 equal ms astable multivibrator.
Uses the 555 timer ic to give an equal mark/space waveform, variable between approx. 500Hz to 0.5Hz | | 3 |
| BATTF | Basic astable two transistor.
Astable multivibrator using two transistors. Fast, output frequency about 700Hz, for building audio frequency generator etc. fixed freq. | | 2 |
| BATTS | Basic astable two transistor.
Astable multivibrator using two transistors. Slow, about one pulse per second, for building flashing led, slow pulses for firing circuits etc. fixed freq. | | 2 |
| CNTDEV | Countdown device.
Excellent circuit, giving a ten led countdown after which a relay is activated. Useful for delay circuit in alarms etc.
Adjustable counting speed. | | 12 |
| DSBO | Dark switch with buzzer output.
A buzzer is activated when lighting level falls. Ever forgotten to put them chickens away at night? Adjustable sensitivity. | | 5 |
| DSLO | Dark switch with led output.
An led is illuminated when lighting level falls. Adjustable sensitivity.
| | 4 |
| DSRO | Dark switch with relay output.
A relay is activated when lighting level falls. Operate garden lights, security lights etc. Adjustable sensitivity. | | 6 |
| DTSRO | Darlington touch switch with relay output.
Control just about anything with the touch of a finger on a pair of contacts. | | 5 |
| EDTR | Event delay timer with relay.
Gives a timed output for alarm entry / exit devices etc., or power many devices for a set period of either approx. four, eight, seventeen, thirty-four or seventy minutes, controlled by an on-board jumper connection. | | 10 |
| LADSO | Liquid alarm Darlington sounder output.
On-board sounder is activated by a two-transistor high gain Darlington amplifier. A stripboard for a sensor is ordered separately, (order code LSS). | | 4 |
| LDD | Lie - Damp detector.
Two in one kit. Led output can be used to find damp areas of internal dwelling walls to find problems before damp causes a lot of damage Kit also doubles as a lie or stress indicator . Adjustable sensitivity. | | 3 |
| LGABO | Logic gate astable buzzer output.
A good introduction to using logic gates, this kit uses three of the four gates that are contained in one ic, demonstrating how an oscillator is built, and the use of a buffer stage, to operate a buzzer. | | 4 |
| LGALO | Logic gate astable led output.
A good introduction to using logic gates, this kit uses three of the four gates that are contained in one ic, demonstrating how an oscillator is built, and the use of a buffer stage, to produce a flashing led that can be used as a dummy alarm indicator etc. | | 3 |
| LGARO | Logic gate astable relay output.
A good introduction to using logic gates, this kit uses three of the four gates that are contained in one ic, demonstrating how an oscillator is built, and the use of a buffer stage, plus a transistor driving a relay. The relay switches in and out, so could be used to operate hazard lamps, novelty displays, alarm beacons etc. | | 6 |
| LSBO | Light switch buzzer output.
Simpler circuit than the 555LABO kit, activates a miniature buzzer that has a self contained driver circuit. | | 5 |
| LSLO | Light switch led output.
Light operated transistor switch which switches an led when light level increases. | | 3 |
| LSRO | Light switch relay output.
Light switch which operates a relay when light level increases, so as to operate a multitude of devices such as motors, automated curtains, dawn wake-up alarm, chicken house door opener, turn water sprinklers off etc. etc. | | 6 |
| LSS | Stripboard suitable for fluid / rain sensor.
Length of stripboard that can be utilised as a sensor for the fluid and rain sensor kits. | | 1 |
| OHBO | Overheat with buzzer output.
Saves getting hot under the collar, a buzzer sounds when the temperature reaches a (variable) set level. | | 4 |
| OHLO | Overheat with led output.
An led is illuminated when the temperature reaches a (variable) set level. | | 4 |
| OHRO | Overheat with relay output.
A relay is activated when the temperature reaches a (variable) set level, maybe to control a heating system, fan etc. | | 6 |
| OIC | Opto-isolator circuit.
The humble opto-isolator has many uses but is often forgotten about. This kit demonstrates simply how the opto works. | | 4 |
| OIRO | Opto-isolator relay output.
The opto-isolator is used here to switch a relay, to demonstrate how a small control signal can be optically isolated from the /^real world/^ so as to operate a relay that can control and switch much greater loads and voltages. Could be utilised for driving large current circuits from a PC port. | | 6 |
| RBTD | Relay board with transistor driver.
Module circuit with a multitude of uses, contains a relay with a set of contacts that switch from normally closed or normally open. The relay is driven by a transistor, which requires only a small amount of current to activate the circuit, even a wetted finger can turn the relay on. Hundreds of uses. | | 4 |
| SLBM | Single led battery monitor.
Demonstrates how a zener diode can be used as a voltage reference device, that when a supply voltage falls to a (variable) set level, an led is illuminated. Used in many devices that require permanent monitoring of battery voltage, e.g. burglar alarms, portable devices such as emergency medical apparatus, automobile batteries etc. | | 3 |
| SRG | Snap reaction game.
Shows the way that transistors switch, in a fun way! Leds illuminate to show which of the two players pressed first. | | 4 |
| ST | Schmitt trigger.
Demonstration circuit of how a two-transistor schmitt trigger is superior for switching from a ^woolly^ input compared to the switching characteristics of a single transistor. Two boards, one single transistor switch and one schmitt switch. | | NA |
| STDB | Simple transistor driven buzzer.
Module circuit which is a transistor driven buzzer that only requires a small signal on the input to switch on the buzzer. | | 3 |
| STDL | Simple transistor driven led.
Module circuit which is a transistor driven led that only requires a small signal at the input to turn the led on. | | 3 |
| STDR | Simple transistor driven relay.
Module circuit which is a transistor driven relay with a set of contacts that switch from normally closed or normally open. The relay is driven by a transistor, which requires only a small signal on the input to activate the circuit. Hundreds of uses. | | 4 |
| TABO | Transistor astable buzzer output.
Three transistor circuit that uses two transistors as an audio frequency oscillator and a third transistor as a buffer / amplifier to drive a sounder device, giving a pulsating output for warning devices etc. | | 5 |
| TALO | Transistor astable led output.
Three transistor circuit that uses two transistors a slow oscillator and a third transistor as a buffer / amplifier to drive an led, the pulsating led could be used as a ^dummy alarm^, form part of a real alarm or indicator. | | 4 |
| TCRBO | Timer CR buzzer output.
Demonstrates the timing method of a resistor and capacitor in series, where a buzzer is activated after the timing period. | | 4 |
| TCRLO | Timer CR led output.
Demonstrates the timing method of a resistor and capacitor in series, where an led is activated after the timing period. | | 3 |
| TCRRO | Timer CR relay output.
Demonstrates the timing method of a resistor and capacitor in series, where a relay is activated after the timing. | | 6 |
| TINV | Transistor inverter.
An excellent little circuit that uses two leds to indicate the state of a switching transistor, one led shows that the transistor is switched off, the other led shows when the transistor is switched on. Could connect to one of the slow astable circuits. Connected to a burglar alarm switch, would show the status if the entrance door or window is open or closed. | | 3 |
| TLBM | Traffic lights battery monitor.
Uses zener diodes to switch a multi-led array so as to monitor a car battery output. Very useful during winter months to constantly monitor the car battery performance. The unit could be attached to the dash, gives an attractive ^traffic lights^-style display. | | 4 |
| UHWBO | Underheat warning buzzer output.
Saves getting hot under the collar, a buzzer sounds when the temperature falls to a (variable) set level. | | 5 |
| UHWLO | Underheat warning led output.
An led is illuminated when the temperature falls to a (variable) set level. | | 4 |
| UHWRO | Underheat warning relay output.
A relay is activated when the temperature falls to a (variable) set level, maybe to control a heating system etc. | | 6 |
