Electronics notation question for a beginner

[VAMM]

Hello,

I have a Lafayette LR-5555 that I picked up to play around with and maybe learn something about electronics. I am attempting to read the schematics (actually Setton RS-440 but they are the same) and in the process, I have come across some notations that I do not understand.

For instance, there are resistor values that are noted as (for example) 101 1/21. I also see capacitors noted similarly, for example, 100/23.

Would someone be so kind as to explain how these are read?

 

[Binkman]

Greetings and welcome to ak.

Part I.d. i.e. C101 then the value and then the voltage. and note many schematics vary by description. uf microfarad or 'p' pico farad.

Resistors. I.d. R101 value in ohms. *see notes in schematics. values for resistors may mean 1watt/value or as noted. Get familiar with sizes of resistors.. 1/4 watt 1/2 watt 1 watt as example.

Transistor is usually ic or t or tr i.e IC301 or tr304,.

The symbols are usually world wide but how presented can be confusing. search up terms and symbols and look at other service manuals.

 

[VAMM]

Hi Binkman. Thanks for the welcome and the explanation. The capacitor explanation makes sense except for caps where only the farad values are noted. Is there a "common value" voltage rating that is used when it is not notated?

Unfortunately, the resistor explanation still does not make sense to me. The values that I interpret make no sense (as far as I can tell). I'm guessing there are a bunch of values in that notation that just look like on number because of spacing.

For instance, one value looks like there is an additional space that the example I gave above does not show:
R103
10 1 1/21

thinking further, maybe this should really be:

R103
10 1 1/2 1
from which I could guess 10 ohms and perhaps 1 watt? The remaining values leave me stumped though. Perhaps one is a tolerance percentage?


I'll have to try digging into the receiver when I get a chance and fishing out one of these resistors. Maybe it has the color bands on it and they will help decipher these peculiar notations.

Thanks again for your assistance.

 

[cademan]

Can you scan the schematic and post it here?

Most resistors are color banded except the high watt resistors which usually have the values printed on them.

 

[VAMM]

Cademan,

I have a pdf of the schematic but I'm not sure how post it. Here is a snip of the section with the resistors in question if that helps. R102 is at the top and R103 is at the bottom.

 

[wmgwizard]

I think you may be misinterpreting a parentheses for a number 1.

I read them as 10 ohm 1/2 watt.

I read c96 & c97 as 100mfd, 35 volt.

 

[heehaaa]

I think you may be misinterpreting a parentheses for a number 1.

I see parentheses too.

 

[jannsvej]

I recently read 1.2V as 12V - boy did that confuse me. Figured it out when I looked at a better quality schematic - I guess that's the case with a lot of schematics for older equipment. Have you tried the AK database? There is often better quality scans.

I also read it as parantheses

 

[VAMM]

I think you may be misinterpreting a parentheses for a number 1.

I read them as 10 ohm 1/2 watt.

I read c96 & c97 as 100mfd, 35 volt.

AH HA! Now that you say it, it seems so obvious and yet I've been looking at this thing for days wondering what that darn notation could mean. I thank all of you for the replies and your patience hand holding this rookie.

I look forward to working on this Lafayette and getting it running. And with any luck, I'll achieve my goal without burning the house down!