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Components and Circuits For discussions about component types, alternatives and availability, circuit configurations and modifications etc. Discussions here should be of a general nature and not about specific sets.

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Old 1st Aug 2018, 7:03 pm   #1
radioman
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Default Unknown DIL component ID

Hi,
I recently obtained a couple of tubes of these components but have no idea what they are.
Before I start testing them to try and find out, I was wondering if anyone actually recognizes them ?
Google searches have provided no clues.

Andy
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Old 1st Aug 2018, 7:09 pm   #2
woodchips
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Default Re: Unknown DIL component ID

Transformer.
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Old 1st Aug 2018, 7:10 pm   #3
Trevor
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Default Re: Unknown DIL component ID

Agreed
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Old 1st Aug 2018, 7:16 pm   #4
SiriusHardware
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Default Re: Unknown DIL component ID

Possibly a BALun, then?
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Old 1st Aug 2018, 7:24 pm   #5
elanman99
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Default Re: Unknown DIL component ID

I've seen these mostly on PC Ethernet cards so it probably contains four transformers.

Ian
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Old 1st Aug 2018, 7:44 pm   #6
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Default Re: Unknown DIL component ID

Possibly delay lines - not enough pins for 4 transformers but could be 3

J
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Old 1st Aug 2018, 8:07 pm   #7
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Default Re: Unknown DIL component ID

I would go with a delay line. We used to use a lot of small BAL delay lines that looked a lot like that in a professional video company I used to work for in the 80s.
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Old 1st Aug 2018, 9:29 pm   #8
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Default Re: Unknown DIL component ID

They also look as if the top cover can pop off - maybe an opportunity to show us the insides - even if it is 'only' a transformer.
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Old 1st Aug 2018, 10:43 pm   #9
Chris55000
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Default Re: Unknown DIL component ID

Hi!

http://www.allenavionics.com/V_Delay/BAL10_30.htm

I'm hazarding a guess that the part no. you've shown means a 10MHz base type and the final digits are the nominal delay in nanoseconds – B10995 = 10MHz series, nom delay = 995ns.

Any help?

Chris Williams
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Old 2nd Aug 2018, 7:44 am   #10
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Default Re: Unknown DIL component ID

Thanks guys, this is all very helpful !
Taking resistance readings across the pins gives low values of less than one ohm across many of the pins, so transformer(s) made sense.
I don't know anything about delay lines : what they contain or how they function so am not sure what sort of readings to expect in this case.
Last night, I decided to saw the top of one to find out what was inside... unfortunately it's completely filled with resin and even taking the top half off revealed nothing.
If this was a transformer I'd expect to find some cores but whatever this is, the main parts must be on the base and be very small.
I will start to chip away at it later on today to see if anything further is revealed.

Andy

Last edited by radioman; 2nd Aug 2018 at 7:45 am. Reason: Typo
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Old 2nd Aug 2018, 12:01 pm   #11
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Default Re: Unknown DIL component ID

Thanks Chris for that BAL link - it certainly appears to be a delay line.
I took one apart this morning... see pictures below.
First components to be found were some SMD capacitors - I measured one at 200pF, these were connected to most pins and then to a central common connection. When the caps were removed there was a strip of waxed paper and beneath this was an encapsulated inductor as I could see some windings at one end.
As this sacrificial one was now too damaged to take any readings from, I got another and determined that it has a single multi-tapped inductor with a total inductance of ~14uH (DCR=3.5R) although this is probably inaccurate due to the capacitors in circuit.
Not sure what I'll do with them now (I've got 49 left) - any suggestions ?
Are they still used nowadays ?

Andy
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Old 2nd Aug 2018, 4:12 pm   #12
TonyDuell
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Default Re: Unknown DIL component ID

I certainly have used them 'within living memory'.

More seriously, RS and Farnell stock delay lines, albeit in surface mount (SOIC, etc) packages with internal buffers to make them easy to interface to logic ICs. So I guess they are still used in modern stuff.
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Old 5th Aug 2018, 7:54 pm   #13
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Default Re: Unknown DIL component ID

I once made a single transistor phase shift oscillator with a delay line like that. It was just a demo board and was just put to one side after I had a play with it.
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Old 5th Aug 2018, 10:01 pm   #14
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Default Re: Unknown DIL component ID

Quote:
Originally Posted by radioman View Post
Thanks guys, this is all very helpful !
Taking resistance readings across the pins gives low values of less than one ohm across many of the pins, so transformer(s) made sense.
I don't know anything about delay lines : what they contain or how they function so am not sure what sort of readings to expect in this case.
Last night, I decided to saw the top of one to find out what was inside... unfortunately it's completely filled with resin and even taking the top half off revealed nothing.
If this was a transformer I'd expect to find some cores but whatever this is, the main parts must be on the base and be very small.
I will start to chip away at it later on today to see if anything further is revealed.

Andy
I like that approach! I've done that sometimes when I know what the component is - just to see what's inside!!

John
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Old 5th Aug 2018, 11:13 pm   #15
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Default Re: Unknown DIL component ID

We made DIL delay lines and filters like that when I was a trainee at a place supplying components for the nascent digital broadcast equipment industry, late 1980's.

Ours were rather better made though, with a tiny custom pcb inside containing the SMD and any inductors wound on tiny bobbins or toroids. One of my jobs as a junior was soldering the pcb into the DIL header, glueing the lids on with epoxy, mixing a batch of potting compound, getting rid of any air in the vacuum chamber and finally potting them.

This type of thing is very labour intensive and they didn't come cheap.
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