WTB: NSM3915 LED Bar Graph Module

[Oberheimer]

Looking for a National Semiconductor NSM3915 10-LED display module. Please contact me if you have any for sale or if you know of a source. Thanks!

 

[Nigel Goodwin]

The chips are long discontinued, the modules NSM3915 are long, long long discontinued.

Three times as long as the chips

There are plenty of PCB kits on AliExpress, such as this one:

https://www.aliexpress.com/item/32672369884.html?spm=a2g0o.productlist.main.95.559bpz6hpz6hVn&algo_pvid=8c29330c-2198-4185-add4-8175507aa80c&algo_exp_id=8c29330c-2198-4185-add4-8175507aa80c-47&pdp_npi=4%40dis%21GBP%211.04%210.88%21%21%211.26%21%21%402103850917007441816708310e43df%2160135945601%21sea%21UK%211751606289%21&curPageLogUid=JhTgWIcqARPV

But no sign of any of the old COB modules.

 

[audioguru]

The LEDs in the 60 years old modules I have are very dim. I used them for only a couple of hours. Modern LEDs are much brighter.

 

[Pommie]

They are available around the corner from me. Or are they?

LM3915 Log LED Bar/dot Driver IC | Jaycar Electronics

LM3915 LED Bar/dot Driver Linear IC

www.jaycar.com.au

 

[audioguru]

Pommie, you show the obsolete IC that is not made anymore. This thread is talking about the Module that has a pcb with some surface mounted parts on it.

 

[Nigel Goodwin]

Pommie, you show the obsolete IC that is not made anymore. This thread is talking about the Module that has a pcb with some surface mounted parts on it.

Check my link from post #21, plenty of Chinese versions of the IC available, which are presumably what Jaycar are selling, with a huge markup.

 

[ZipZapOuch]

Pommie, you show the obsolete IC that is not made anymore. This thread is talking about the Module that has a pcb with some surface mounted parts on it.

And an LED diffuser (white frame with a strip of diffusion film inside.

 

[Tony Stewart]

& LM3914 will work too

 

[ZipZapOuch]

View attachment 143405& LM3914 will work too

It's cute unless he is repairing a UV meter on a stereo and looking for a direct replacement instead of a cobbled to get her diy solution. These modules were fitted with a female header and simply plugged into the front of a stereo receiver and the face-plate fitted over everything. It would be sad to hack together a classic receiver if an NSM3915 (or TSM3915) can be found. The TSM was made longer and is electrically equivalent. The PCB is cleaner and better designed.

 

[Oberheimer]

I have one sitting on my desk, still in original RS Components packaging. Provided that 1 is enough, drop me a message and we can sort postage

ryro25 Still around? Kindly respond to my PM. Thank you

 

[ryro25]

ryro25 Still around? Kindly respond to my PM. Thank you

Yep! I replied to you with pictures on Wednesday last week, waiting for your reply

 

[Oberheimer]

Would a 3914 work for you or do you need the log version?

ZipZap, sent you a PM. Thanks!

 

[audioguru]

A single or a few LM3915 ICs in series have steps that all sound like the same amount of changes.

A single LM3914 has its steps sound far apart when at low levels and the steps are close together at high levels.
A few LM3914s in series have their steps sound extremely far apart and extremely close together.

 

[ZipZapOuch]

ZipZap, sent you a PM. Thanks!

Did you use the "chat" or the envelope ("conversation") icon above? I was notified there was a private chat waiting for me but I think those disappear when surf away from ETO. Try the envelope icon above.

 

[techpeople1]

Search for the NSM3915 on Partstack. Good luck!

 

[edk76]

If you haven't found one, have (1) NSM3915 NOS in the original pack.

(A place to source them are old Startek Frequency Counters that have the LED Bar Graph above the LED display. ATH Series and others.)

 

[danadak]

Ideally how many led steps / db range do you want ? One simple
board easily done .......