https://www.facebook.com/vacuzmachinefactory/videos/1849900919208187/?mibextid=9drbnH&s=yWDuG2&fs=e
Archive for the ‘Inductors’ Category:
2024-08-06 Toroid Inductance Charts
I wound a FT37-43 with 10 turns and measured it at 42 uH, just like it says. https://www.electronics-tutorials.com/basics/toroidcharts_mcq.htm Also visit Ian Purdie VK2TIP’s “Toroids” Page
2024-03-29 FM Crystal Set Uses Helical Resonator For Tuning
This is a long article but a very interesting project. It uses HSMS-2850 Schottky detector diodes in a discriminator. He uses WE 1200 ohm sound powered headphones. He’s Canadian. https://electronbunker.ca/eb/FMCrystalSet.html
2024-02-11 Calculations: Ferrite Loopstick for a Crystal Set
I think this came from a crystal set made in Japan during the mid-20th century. It has a ball on the end of the ferrite rod like the crystal sets that were shaped like a rocket and this ball was at the rocket’s nose. The coil measures 38 to 380 microhenrys depending on the position
(Read More…)
2020-03-10 Simple AM Band Antenna Tuning Coil 240 Microhenrys
The standard ferrite antenna loopstick for a 365 pF tuning capacitor has an inductance of about 230 microhenrys. This in combination with the tuning capacitor tunes across the full AM broadcast band. It’s useful to be able to wind your own inductor so it can be used for an antenna coil, a trap to attenuate
(Read More…)
2020-02-21
I found that 100 uH was a good all around value for these solar garden light circuits. But at the time I made these around 2009 the 5252 4 legged chip was uncommon and almost all the garden lights used 2 discrete transistors. I don’t know why they started using the 4 legged 5252 –
(Read More…)
2018-09-07 Q of an Inductor
from FB group Building Transistor Radios, 2018-09-07 Tom Miller Say a capacitor or inductor has a Q of 100. The losses are about 1/100 of the energy in the component. In a tuned circuit the capacitor Q is usually much higher than this – it has lower losses, so the more important is the Q
(Read More…)
2017-06-02 I Built Another Oscillator For AM BCB
I pulled a pill bottle out of my junk box, it had a single layer of solid enameled wire wound on it, and it measured 85 microhenrys. So I added the transistor, resistors and the capacitors to get it to oscillate at the low end of the AM BCB, around 540 kHz. The schem is
(Read More…)
2016-09-05 Ferrite Cores At Radio Frequencies
I have always thought that using ferrite toroid cores for radio projects at HFs and above was not necessary, because all of the RF circuit parts lists call for low permeability powdered iron cores. I’ve never given it much thought; about the only thing that crossed my mind was that the powdered iron cores may
(Read More…)
2016-06-05 Toroid Cores 10 mm .4 Inch Green
I was on eBay and saw some small green ferrite toroid cores, ten for 99 cents including shipping. I figured that since I had bought some larger green cores a few weeks ago and liked them, I couldn’t go wrong buying these since they were less than ten cents apiece. They were sent from an
(Read More…)
