Help Finding a Part

Projects General Guidance
1

I'm trying to build this project in a electronics book, but they are calling for a 3M Ohm Crystal Earpiece. Its supposed to be ESR Electronic Components 203-004.

That is a UK-based company. They have no search feature on their website www.esr.co.uk (at least that I can find), so I can't find the component, and I don't even know if they would ship to the United States.

I've searched Google for that part number but it doesn't come up with anything. I contacted the company but never heard anything back.

Does anyone know where I can get this part, or one that does the exact same thing?

I posted a picture of the part below.

Based on the picture, I'm assuming that this "earpiece" works as both a speaker and microphone.

03071349580.jpg
03071349580.jpg800×600 77.7 KB

2

I think you're looking for this

3

Takes me back to when I used to use them in making crystal sets - that's radios that don't need a power source to work for the youngsters.

4

So I found something from the search, but the part appears to be different, these don't look like 3M Ohm. I don't know if that will make any difference.

5

Oh, come now Mike, how are you going to run the DAB DSP? :stuck_out_tongue_closed_eyes:

6

AWOL:
Oh, come now Mike, how are you going to run the DAB DSP? :stuck_out_tongue_closed_eyes:

Well you tap off power from the Drotwitch Transmitter Station, rectify and smooth, then feed into the DAB decoder.

7

Back on topic:-
How about this?

8

It's amazing, isn't it, how the design of those hasn't changed in the last 40 + years?
My older brother had a Phillips electronics set, and the earpiece was identical, c. 1968.