Voltage Spike
New Member
First post here (be nice). . .
I have messed with simple stuff when it comes to DIY DC circuits and have even made some pcb's from scratch but still with very simple stuff. Now I am very interested in making an efficient Joule Thief circuit that simply lights an LED and runs with a so called dead AA battery. Then comes the toroid. I never really understood inductors for years and now I have to. They seem simple enough but they can be used in multiple ways like suppression to clean up noise and also to make a transformer. I want to make a transformer that uses a transistor, a resistor, an LED, and a toroid, along with the AA battery. There are many designs on the internet. That is where my toroid confusion comes from. I gather that a ferrite toroid is better than an iron toroid so that is easy enough. But all the instructables and youtube videos seems like there is a lot of "winging it" going on. So my questions:
1. Best toroid type to use? Many different options out there when it comes to colors and specs.
2. High or low permeability?
3. Wire size smaller or larger with more or less wraps? What range in uH values are best for efficiency?
4. Single layer wraps only or can I wrap over existing wires when making my toroid?
That ought to be me going. I have some 30 AWG wire wrap wire and also some 32 AWG enameled magnet wire plus some thicker if needed. And I already bought some small toroids based on my internet research where one guy said this was the best one he found and had specs to show the facts. I bought these:
tinyurl.com
Thanks in advance,
VS
I have messed with simple stuff when it comes to DIY DC circuits and have even made some pcb's from scratch but still with very simple stuff. Now I am very interested in making an efficient Joule Thief circuit that simply lights an LED and runs with a so called dead AA battery. Then comes the toroid. I never really understood inductors for years and now I have to. They seem simple enough but they can be used in multiple ways like suppression to clean up noise and also to make a transformer. I want to make a transformer that uses a transistor, a resistor, an LED, and a toroid, along with the AA battery. There are many designs on the internet. That is where my toroid confusion comes from. I gather that a ferrite toroid is better than an iron toroid so that is easy enough. But all the instructables and youtube videos seems like there is a lot of "winging it" going on. So my questions:
1. Best toroid type to use? Many different options out there when it comes to colors and specs.
2. High or low permeability?
3. Wire size smaller or larger with more or less wraps? What range in uH values are best for efficiency?
4. Single layer wraps only or can I wrap over existing wires when making my toroid?
That ought to be me going. I have some 30 AWG wire wrap wire and also some 32 AWG enameled magnet wire plus some thicker if needed. And I already bought some small toroids based on my internet research where one guy said this was the best one he found and had specs to show the facts. I bought these:
B64290L0038X038 EPCOS - TDK Electronics | Magnetics - Transformer, Inductor Components | DigiKey
Order today, ships today. B64290L0038X038 – Epoxy T38 Ferrite Core Toroid Type Length Width 0.425" (10.80mm) Diameter 0.187" (4.75mm) Height from EPCOS - TDK Electronics. Pricing and Availability on millions of electronic components from Digi-Key Electronics.
Thanks in advance,
VS
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