Day 7: Metal Detector
a lot about today but things actually went very smoothly. Started taking
one of the radios apart and testing the transistors to work out their
connections. Made up a simple circuit board from the lid of a Tupperware
box and started to solder up the components. Made up a simple oscillator
circuit and wired it up to the search coil. Then made up another search
coil and with a diode from the radios was able to make up a field strength
meter and showed that the oscillator was working OK. Filmed this with
Kathy. Then made up the second oscillator using the medium wave coil from
the radio. This worked as well!!
wired up the mixer circuit and wired in the various oscillators and the
audio amp from the smaller radio. Turned it on live and had it filmed
and to my amazement it worked first time. It was low in volume but it
worked!! Added the component and also an extra stage of audio amp and
the metal detector was working. This was a nice stage to be in on day
2 of the first programme we have proved the "Rough Science"
and so for me a major hurdle has been leapt.