22
1.2 Tips
1.2.1 Successful equipping
A perfect connection is the alpha and omega for your experiment to succeed. But a problem with a contact
in an electrical system brings even a car to a halt.
Make sure that the jumper wires of components are all free of grease and dirt. The ends should be straight-
ened. The board‘s contact holes are sometimes very tight, especially in the beginning. A bit of force and
skilfulness are needed to insert the wire ends into the board. The best bet is to use a pair of good tweezers
for support. A part of the wire ends must be fitted into the plug contact. If you are not sure, pull a bit on the
wire. If the wire remains tight in the board, it is properly inserted.
1.2.2 Simple bending jig
Tidy home, tidy mind! In our case this means that clean angled jumper wires will at least let you keep
track and increase the probability that everything is wired correctly. You can only successfully reproduce
our experiment, if everything is properly connected. A very handy tool that is equally small is shown in
Fig. 1.50
. You can easily make it yourself using a standard perforated board. Use it to create clean angled
jumper wires with widths of 1 x spacing to 12 x spacing
Fig. 1.50:
Bending jig, cut from a perforated board
1.2.3 Acoustic panel
The Piezo element enclosed works also, if it is not installed in a suitable housing; however, sensitivity
might be a bit underwhelming. A sound plate is easy to make and it significantly enhances its performance.
Fig. 1.51
has an example. A hole is cut out of the centre of a round metal or plastic plate. The Piezo element
will be fitted in (the outer diameter is about 100mm, the cut-out for the Piezo element should be 24mm
exactly). Use epoxy resin, which has good bonding capabilities. Installing it into the lid of a matching box
(dimensions as above, the can’s height is irrelevant) is the best solution however. The level of sensitivity
achieved by this, is comparable to the one of commercial crystal headphones.
Содержание ELECTRONICS EXPERIMENTS BOX
Страница 4: ......
Страница 251: ...253 Fig 3 27 Circuit 27 4 seconds switch off delay Fig 3 28 Circuit 28 20 seconds switch off delay...
Страница 258: ...260 Fig 3 42 Circuit 42 Active 8 5V battery monitor Fig 3 43 Circuit 43 Active 7 8V battery monitor...
Страница 260: ...262 Fig 3 46 Circuit 46 Meters for 1 5 V Zener diodes and higher Fig 3 47 Circuit 47 Discreet 2 2V Zener diode...
Страница 261: ...263 Fig 3 48 Circuit 48 Discreet 2 9V Zener diode Fig 3 49 Circuit 49 Discreet 3 7V Zener diode...
Страница 265: ...267 Fig 3 56 Cir cuit 56 Audio limiter Fig 3 57 Circuit 57 Amplifier for a storm detector...
Страница 269: ...271 Fig 3 64 Circuit 64 Stabilizer for 1 9 V Fig 3 65 Circuit 65 Stabilizer for 2 5 V...
Страница 275: ...277 Fig 3 80 Circuit 80 Quiztimer 30 seconds Fig 3 81 Circuit 81 Handy diode tester...
Страница 290: ...292 Fig 3 118 Circuit 118 HF watch dog with LED indicator Fig 3 119 Circuit 119 HF watchdog with moving coil instrument...
Страница 295: ...297 Fig 3 130 Circuit 130 4 seconds switch on delay Fig 3 131 Circuit 131 15 seconds switch off delay...
Страница 298: ...300 Fig 3 136 Circuit 136 NAND gate with moving coil instrument Fig 3 137 Circuit 137 Input level Mixing console...
Страница 300: ...302 Fig 3 140 Circuit 140 Electrometer with moving coil instrument Fig 3 141 Circuit 141 Simple AM Radio...
Страница 315: ...317 Fig 3 179 Circuit 179 HF generator 150 kHz Fig 3 180 Circuit 180 HF generator 420 kHz...
Страница 324: ...326 Fig 3 202 Circuit 202 3 seconds switch on delay Fig 3 203 Circuit 203 7 seconds switch on delay...
Страница 325: ...327 Fig 3 204 Circuit 204 Piercing siren sound with Piezo element Fig 3 205 Circuit 205 Discrete Operational ampli fier...
Страница 328: ...330 Fig 3 210 Circuit 210 Discreet 5 2V Zener diode Fig 3 211 Circuit 211 Discreet 7 4V Zener diode...
