2,486
edits
Changes
Jump to navigation
Jump to search
Line 410:
Line 410: + − + +
Activities/Turtle Art/Using Turtle Art Sensors (view source)
Revision as of 01:52, 4 December 2010
, 01:52, 4 December 2010→The XO as an audio amplifier
The tuned circuit capacitor, two sheets of aluminium foil approximately 10cm x 10cm sitting loosely and separated by cling wrap gave a resonant frequency of approximately 1MHz with the above inductor.
The tuned circuit capacitor, two sheets of aluminium foil approximately 10cm x 10cm sitting loosely and separated by cling wrap gave a resonant frequency of approximately 1MHz with the above inductor.
The 0.1uF capacitor can be made in the same way, the tuning capacitor is estimated at 100pF (10^-10 F) when sitting loose. The coupling capacitor needed is of the order of 0.1uF (10^-7 F). Tightly rolling the layers reduces the plate separation and a workable coupling capacitor was made by tightly rolling only 10cm x 10cm plates.
The 0.1uF capacitor can be made in the same way, the tuning capacitor is estimated at 100pF (10^-10 F) when sitting loose. The coupling capacitor needed is of the order of 0.1uF (10^-7 F). Tightly rolling the layers reduces the plate separation and a workable coupling capacitor was made by tightly rolling only 10cm x 10cm plates.
The diode is still required. The original cat's whisker was made with galena crystals.
The diode is still required. The original cat's whisker diode was made with galena crystals.
==Links==
==Links==