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Series Two Kits
for Series 2 Kits
Uses include entry and exit delays for alarms (use Kit 1n to
give a set time OFF), limiting the ringing time of a doorbell and electronic photographic
timers. Kit 1z can be used to interface the monostable to other low voltage
devices or an astable such as Kit 2e or Kit 2f can be controlled directly.
These kits can be used as a visual output for the light,
temperature and moisture sensors of our series one kits. A flashing light is
more noticeable than a steady light. These circuits can be used in many projects
where a flashing light output is required. For example in alarm circuits. Used
with our series one kits you can design light beam alarms, frost warning alarms,
fridge/freezer failure alarms, rain alarms etc.
This type of circuit is useful in alarms and musical
applications. It can be combined with series one kits to make audible
light/dark, wet/dry, or hot/cold sensors or alarms. With a timing circuit (1e or
2a or 2b) it can make a kitchen or darkroom timer.
Uses include latches for alarms, where the set wire is a door or window switch and the reset wire is a push switch to turn off the alarm. Devices or an astable such as Kit 2e or Kit 2f can be controlled directly. Build two light sensors using kits 1c and 1g and you can use them to set and reset this circuit to operate a stop clock or timer to time a moving object between two light beams. Kits 2g or 2h can be used to latch a steady hand game - use kit 2e or 2f to produce the sound output.
|2a||Transistor Monostable (makes a reliable timing circuit)||£2-05|
|2b||Integrated Circuit Monostable (makes a reliable timing circuit)||£2-15|
|2c||Slow Transistor Astable (makes flashing lights)||£2-05|
|2d||Slow Integrated Circuit Astable (makes flashing lights)||£2-15|
|2e||Fast Transistor Astable (makes a sound)||£2-05|
|2f||Fast Integrated Circuit Astable (makes a sound)||£2-15|
|2g||Transistor Bistable Latch circuit||£2-05|
|2h||Integrated Circuit Bistable Latch||£2-15|
NOTE: kits 2e and 2f need a loudspeaker or earphone. See component page for suitable ones.
You will also need a PP3 battery to power these kits.
The following photograph shows KIT 2f (fast integrated circuit astable) when built.
(battery and speaker not included, but available from COMPONENTS page).
KIT 2f (fast integrated circuit astable)
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