The condenser was across the points to suppress arcing. No points, no condenser. It condensed the spark?
Looking at my ARRL handbooks back to the 60s, I don't see a differnetiation. Same with RDH 4, both references are used with choke following a the type of inductor.
Looking at my ARRL handbooks back to the 60s, I don't see a differnetiation. Same with RDH 4, both references are used with choke following a the type of inductor.
Why buy a inductor with unknown core properties when only 2mH inductance is needed? This can easely be done air cored, bougth, or DIY.
1946: https://maritime.org/doc/radio/chap10.php
"The subject of this chapter has two names-CONDENSER and CAPACITOR-and both names are OK. A lot of hot arguments go on over which is the correct name. Some men argue, and probably rightly so, that the name CONDENSER is wrong, since NOTHING is CONDENSED. ........."
https://maritime.org/doc/radio/chap9.php
"COILS and TRANSFORMERS, while much simpler in design and containing NO MOVING parts, also depend upon INDUCTION for their operation. ... Many coils and transformers have special names, such as CHOKES, POWER TRANSFORMERS, INTERMEDIATE TRANSFORMERS, INPUT TRANSFORMERS, and many others. It will not be unusual to hear all coils and transformers called by a general name of INDUCTANCE or INDUCTOR."
"The subject of this chapter has two names-CONDENSER and CAPACITOR-and both names are OK. A lot of hot arguments go on over which is the correct name. Some men argue, and probably rightly so, that the name CONDENSER is wrong, since NOTHING is CONDENSED. ........."
https://maritime.org/doc/radio/chap9.php
"COILS and TRANSFORMERS, while much simpler in design and containing NO MOVING parts, also depend upon INDUCTION for their operation. ... Many coils and transformers have special names, such as CHOKES, POWER TRANSFORMERS, INTERMEDIATE TRANSFORMERS, INPUT TRANSFORMERS, and many others. It will not be unusual to hear all coils and transformers called by a general name of INDUCTANCE or INDUCTOR."
Starting with Post # 1, and continuing all the way to Post # 22, I have not seen a detailed description of what this filter is to be used for.
Switching power supply DC output low pass filter?
20Hz to 20kHz Bandpass filter?
Some other application?
Example:
A filter for an efficient switcher that is at a 25kHz rate, there may be harmonics out to 500kHz or more.
By the way, there has been no discussion of what frequency the filter capacitor impedance is minimum, and what the inductive reactance of the capacitor is above that frequency.
If you are designing filters, do you know what a re-entrant frequency means?
Optimal filter designs are not simple.
Switching power supply DC output low pass filter?
20Hz to 20kHz Bandpass filter?
Some other application?
Example:
A filter for an efficient switcher that is at a 25kHz rate, there may be harmonics out to 500kHz or more.
By the way, there has been no discussion of what frequency the filter capacitor impedance is minimum, and what the inductive reactance of the capacitor is above that frequency.
If you are designing filters, do you know what a re-entrant frequency means?
Optimal filter designs are not simple.
It’s funny that you hear coke, common mode or differial choke but I’ve not seen a common mode inductor or differential mode inductor.. although i have s ferrite common mode inductor (designed for 25MHz).
It’s a bit like transformer and Balun. Just seems a specific purpose has it’s own name for what is a impedance matching balanced/unbalanced centre tapped transformer.
It’s a bit like transformer and Balun. Just seems a specific purpose has it’s own name for what is a impedance matching balanced/unbalanced centre tapped transformer.
Often it is just a continuation of what generic label was attached many many decades ago for a particular group of parts for a particular application. As with labels like Balun, and RFC, the term Ballast has generically labeled the iron-core inductor used for current regulation in fluorescent light fixtures and btw make excellent chokes for 'choke input' mains frequency dc output power supplies as well as CLC filters in such power supplies, as the SRF is typically significantly higher than in a nominal EI core choke and the safety/insulation is designed for a 250Vac mains application.
A center tapped choke across open wire lines is often used to short common mode voltages to ground.
The CT goes to ground.👍
If this is in an audio path why not choose an air cored choke? Something at this source would work for you.
https://solen.ca/en/categories/inductors/products
That’s for link, they seem good. I wanted to avoid air core, because of size, it also seems they are more expensive. Also concerned about the large magnetic fields size of air cores as I have other magnetic components nearby. That’s why I suggested the two I did above, I know they won’t saturate as well.
From what I understand above it was spoken somehow in semantic terms.
In Italy, eg to define what the Anglo Saxons call "choke" it is simply called filter inductance. We do not have an equivalent term in Italian. In general inductance is used for something big, with core, etc while inductor is mostly a component on circuit, smaller.
French people instead call "bobine" (bobbin) to define various elements, eg. reactance bobbin, HF blocking b. etc.
In Italy, eg to define what the Anglo Saxons call "choke" it is simply called filter inductance. We do not have an equivalent term in Italian. In general inductance is used for something big, with core, etc while inductor is mostly a component on circuit, smaller.
French people instead call "bobine" (bobbin) to define various elements, eg. reactance bobbin, HF blocking b. etc.
Maybe inductor is fr the induscive element in some signal circuit without power. (refering to reactive RLC components)
and Choke is for laminated core body, with gap, inductor for in power supply network or combined network?
and Choke is for laminated core body, with gap, inductor for in power supply network or combined network?
Fwiw Lundahl use the same winding geometry for their ps and plate chokes. It is perhaps the reason they sound so good in power supplies.
A side note on what I said above,..actually inductor here is rarely used in common speaking (apart the field of physics).
Inductance instead is the most used, from the small to the biggest components in various meanings.
Inductance instead is the most used, from the small to the biggest components in various meanings.
35 Posts, and we have heard all about inductance, inductors, chokes, reactors, laminations, air core, air gap, saturation, distributed capacitance, resonance, bandwidth, etc.
Now . . . let's hear about how the Original Poster's Filter is progressing.
Is it designed?
Have the parts been ordered?
Is it built yet?
Did all of you forget what this thread was about in the beginning?
Now . . . let's hear about how the Original Poster's Filter is progressing.
Is it designed?
Have the parts been ordered?
Is it built yet?
Did all of you forget what this thread was about in the beginning?
Imho the original post should remain unedited, except perhaps for adding a clearly identified addendum, or better still by adding a new post with new details/conclusion, otherwise it is difficult to review the thread in years to come and make sense of it.
Just stating it will operate between 20Hz-20kHz may well be a naive comment for some applications, so I'd suggest the actual use details be provided so that others have some confidence that any technical response is actually covering all aspects of operation that should be reviewed.
One concern is that those linked datasheets show no technical detail relating to the anticipated simple 20-20kHz use, and you have made no comment on the +/-10 or 15% inductance tolerance, or the 5701 specs relating to inductance variation with increasing ac current (ambiguous as to whether that is included in the +/-15%), or if there is a dc current component aspect to the application.