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/diy/ Do-It-Yourself

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Anonymous 2015-09-26 14:05:25 No.880229

[Missing image file: ]

What happened to the /ohm/ thread?

Can someone tell me what band this is supposed to receive?

also, what are the BR components?


>>
Anonymous 2015-09-26 14:12:41 No.880231
the antenna is called FM17 which is probably a clue. the BRs are metal packages that contain two coils and 2 caps; the coils usually have a ferrite slug that you can adjust, to tune it. they're usually used as tuned IF transformers, but other functions are possible.

>>
Anonymous 2015-09-26 14:33:47 No.880237
>>880229
>What happened to the /ohm/ thread
Died of old age.
>what band this is supposed to receive
It's an AM radio, most likely for medium waves. Exact range depends on component values which aren't indicated.
>what are the BR components
Multiple different components are marked BR something: inductors, variable capacitors, IF transformers.

>>
Anonymous 2015-09-27 00:07:28 No.880452
>>880229
the if local oscillator frequency is at 456khz so its probably an am radio (535khz to 1700khz).

>>
Anonymous 2015-09-27 00:52:42 No.880483
I want to make an music player for different formats (mp3, flac, etc). Which microcontroller should I choose? I was thinking MSP-432( http://www.ti.com/tool/msp-exp432p401r). I have some experience with programming the MSP430 and basic interfacing, but I was wondering if this micro was the most appropriate for handling user inputs, reading from sd card and processing the music file.

>>
Anonymous 2015-09-27 03:22:08 No.880548
>>880229
http://www.radiomuseum.org/r/heath_broadcast_receiver_br_1_b.html

>>
Anonymous 2015-09-27 04:42:14 No.880582
Faggot question here

What's some good value resistors i should stock?, or should i use potentiometers in prototyping and then buy exactly what i need.

>>
Anonymous 2015-09-27 05:01:49 No.880586
>>880582
https://en.wikipedia.org/wiki/Preferred_number#Electronics

>>
Anonymous 2015-09-27 05:07:53 No.880589
>>880586
Wish i understood that thing m8 :(

>>
Anonymous 2015-09-27 05:12:58 No.880595
>>880589
http://www.electronics2000.co.uk/data/itemsmr/res_val.php

E12 Series. You won't use many of the very high ones I should think.

>>
Anonymous 2015-09-27 05:14:12 No.880598
>>880595
Thanks m9

>>
Anonymous 2015-09-27 19:11:59 No.880792
Could I have some advice regarding workstations for electronics plus gaming setups?

I need to get my computer with 24" monitor, soldering station, power supply, tools, and space to work on in such a small area as possible due to moving together with my gf to a really cramped apartment. Anyone have any own experiences or tips regarding efficient workspace?

>>
Anonymous 2015-09-27 20:40:07 No.880840
Hello /ohm/, this is my 18650 haul from today. Those purple pairs are from 2.2v to 2.5v. Will they kill me horribly if I charge them? I've read somewhere that 2.5 is the lower limit. They'll be used for power banks and such.

>>
Anonymous 2015-09-27 20:44:12 No.880844
>>880582

This is what I got, works fine for me (shitty if you need precision though)

ebay dot com slash itm/131504016234?_trksid=p2057872.m2749.l2649

>>
Anonymous 2015-09-27 21:07:01 No.880854
>>880229
http://lmgtfy.com/?q=heathkit+br-1

it says what it is right on the schematic "Broadcast Receiver" that means AM.

>>
Anonymous 2015-09-27 21:22:21 No.880862
>>880840
what's the capacitance?

>>
Anonymous 2015-09-27 21:24:58 No.880867
>>880862

Rated 2200, charging them now. The red ones should be close to that, they came from a pretty recent (not windows XP) MSI laptop.

>>
Anonymous 2015-09-27 21:25:55 No.880868
>>880867
uF?
mF?
F?

>>
Anonymous 2015-09-27 21:26:08 No.880869
>>880862
18650s are batteries not capacitors.

>>
Anonymous 2015-09-27 21:26:56 No.880872
>>880867
>>880869
???

>>
Anonymous 2015-09-27 21:30:48 No.880874
>>880872
The ratings are going to be in milli-amp-hours because they're batteries, not capacitors.

>>
Anonymous 2015-09-27 21:37:15 No.880880
>>880229
>band this is supposed to receive?
IF transformers are 455kHz.
this is standard for AM Broadcast Band receivers
FM receivers usually use 10.7mHz IF transformers.
USA AM Broadcast Band 530 kHz – 1710 kHz

>>
Anonymous 2015-09-27 21:54:48 No.880887
>>880840
2.2V and 2.5V means they are pretty much dead

LiPos shouldn't go below 2.7V and even that is going to give you a low number of charge cycles
generally you wouldn't want them to go below 3V

>>
Anonymous 2015-09-27 22:15:50 No.880899
>>880887

Well fuck. I suppose it'll have to do, as long as they don't have about 10-20 charging cycles. We'll see how it goes, the reds were 2.8-3V

>>
Anonymous 2015-09-27 22:47:45 No.880928
>>880483
You might want a faster Cortex just to make it easier. I have no experience with codecs on microcontrollers though, you probably want to write up the code first and profile it.

>>
Anonymous 2015-09-28 02:43:27 No.881042
How many henry's is this? Google brings up nothng

>>
Anonymous 2015-09-28 03:25:51 No.881056
>>881042
If you are planning to use it for something else that requires a specific inductance you may have to meter it.

>>
Anonymous 2015-09-28 03:46:10 No.881064
If i understand correctly when you put capacitors in parallel you can add the values together for higher capacitance. Same goes for inductors and the opposite for resistors. What if all your components were made like this in an oscillator circuit? Would it work? This is coming from an anon who doesn't have a lot.

>>
Anonymous 2015-09-28 03:53:41 No.881066
>>881064
>Would it work?

If you get the right value. You may be able to cut the plastic off it and vary the number of turn if you need to.

The other thing to consider is there are various types of ferrite.

>>
Anonymous 2015-09-28 03:58:18 No.881068
>>881066
>plastic off it and vary the number of turn if you need to
I don't understand, can you elaborate?

>The other thing to consider is there are various types of ferrite.
What if I just buy the same cheap as fuck brands from China

>>
Anonymous 2015-09-28 06:00:39 No.881103
>>881064
Inductors are like resistors: series connection increases the inductance. If the inductors "see" each others, the the total inductance can be lower or higher than the calculated value.
Extra resistors in oscillator LC tanks are generally unwanted, but you can build an oscillator using either series- or parallel connected components.

>>
Anonymous 2015-09-28 06:23:26 No.881105
>>881068
Some of them are formed like pic related and you could cut the plastic cover off.

>What if I just buy the same cheap as fuck brands from China

Without knowing what you are trying to do with it it is hard to say.







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