Wednesday, December 11, 2024

Bandspread vs range continued from previous post

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If you observed the effects of adjusting the Vcap ratio by adjusting the low end capacitance and the high end by adjusting the "trimmer...
Monday, December 9, 2024

Setting the bandset for a LC tuning circuit.

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As simple as I can state it the tuning range is determined by the CIRCUIT high to low capacitance. When you look at a schematic you may se t...
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...