Diode replacement

W2RKJ · **Joined:** Mar Sun 04, 2012 3:35 pm **Posts:** 42

Greetings to all. I am recapping a Eico 324 Signal Generator. There is a rectifier according to the addendum to the manual described exactly "CR1 Rect., PWR., Silicon, 200V 750PIC". I've searched and read up on the rectifier but I'm having difficulty locating this exact part for replacement. Any suggestions from you Knowledgeable souls?

Rich, W3HWJ · **Posted:** Mar Wed 07, 2012 3:33 am

Just use a 1N4007.

It's cheap, will survive 1000V and half an amp of current. More than enough for any signal generator.

Rich

Johnnysan · **Posted:** Mar Wed 07, 2012 4:15 am

I think the original was a selenium rectifier. Your B+ may be a bit high with a silicon rectifier.

W2RKJ · **Joined:** Mar Sun 04, 2012 3:35 pm **Posts:** 42

I appreciate the responses to date but I'm not understanding what the original rectifier specs are refering to. I've been looking for data but I can't seem to locate it. I don't mind doing the research in fact I enjoy it but this one escapes me.

Thank you

pixellany · **Posted:** Mar Thu 08, 2012 3:32 pm

Where did you get that addendum? Can you post a link.

What exactly is your question about the specs?

Rich, W3HWJ · **Posted:** Mar Thu 08, 2012 5:51 pm

Quote:

the manual described exactly "CR1 Rect., PWR., Silicon, 200V 750PIC".

This is enough spec to do a replacement.

If the original was either selenium or silicon, a 1N4007 is more than adequate as a replacement. You may have to add a resistor if you want the B+ to be the same as it was before replacement (if the original rectifier was selenium).

I have done this kind of replacement in HeathKit and KnightKit sig generators. Easy to do and reliable.

Can you physically describe the rectifier, or show a photo?

Rich

Rich, W3HWJ · **Posted:** Mar Thu 08, 2012 5:55 pm

I looked at the manual for the Eico 324. The rectifier is shown as 50 mA. This means it was most likely selenium.
http://bama.edebris.com/manuals/eico/324/
The transformer secondary is 110 VAC, so it's likely that the rectifier would have been called 200V.

You need a 1N4007 and 5 watt resistor and you're good to go.

Rich

W2RKJ · **Joined:** Mar Sun 04, 2012 3:35 pm **Posts:** 42

OK Folks, here's the addendum.

W2RKJ · **Joined:** Mar Sun 04, 2012 3:35 pm **Posts:** 42

Sorry that's about the best I can copy that addendum. The two lines underlined are the rectifier change.

Rich, W3HWJ · **Posted:** Mar Fri 09, 2012 5:18 am

750 PIV means 750 Peak Inverse Volts.... the max rating for the voltage of the rectifier.

A 1N4007 is 1000 PIV, so it's a good replacement.

Rich

W2RKJ · **Joined:** Mar Sun 04, 2012 3:35 pm **Posts:** 42

OK, Great! My 1N4007 diode will do it. I'm going to study up on this matter if it arises again so I have a clear understanding. Thank you.

easyrider8 · **Posted:** Mar Fri 09, 2012 2:40 pm

Seems you may already have a silicon in your 324, all the later ones came with silicon.

Dave

W2RKJ · **Joined:** Mar Sun 04, 2012 3:35 pm **Posts:** 42

Apparently it is a silicon but I read somewhere when doing a recap, change those out also. Is that correct?

Unusualdesigner · **Posted:** Mar Sat 10, 2012 5:42 am

W2RKJ wrote:

Apparently it is a silicon but I read somewhere when doing a recap, change those out also. Is that correct?

Not really. A silicon diode, as long as it is correctly rated and working, leave it alone. If it ain't broke, don't try to fix it.

Diode replacement

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