Radio Theory and design
Thursday, February 23, 2023
Charging and discharging a coil to power a joule thief.
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Notice the time delay when power is switched on. The CEMF in the coil delays the current buildup. The current continues to build as long a...
Wednesday, February 15, 2023
A closer look at the joule thief or the facinating world of magnetism
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From its humble beginning 200 years ago our understanding and use of magnetism has come a long way. A short history lesson. The telegraph ...
Tuesday, February 14, 2023
The DITS get younger as time passes. The Joule thief lamp as built by the new pair.
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I heard from DIT and she has a pair of twins she assisted in this build. Check it out. Two more DITs. Working with as little as 0.3 volts it...
Saturday, February 11, 2023
to regen or not to regen?
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Mr Tom on TNRB posted an interesting question. Why will this set not perform? If Mr Andersen says it is a good performer we will assume it ...
Saturday, February 4, 2023
Observe the filtering requirements in the deteector circuit.
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One point I failed to stress in the last 4 post is the need for filtering. It seems to be a common practice to question the need for a chok...
Friday, February 3, 2023
The choice is linear or square law - Large signal or Small signal
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You need to know enough to decide between a linear or square law signal detection. The diode response curve is divided into 2 sections. The...
Thursday, February 2, 2023
Modulating Vs Demodulating Vs Mixing part 3
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I adjusted the signals and cleaned up this circuit quite a bit. So do we want a switch or a non-linear device? The answer is yes. The nex...
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