ceramic capacitor codes

H

hannobisschoff@gmail.com

Member

• Mar 26, 2011

• #1

Hi, I'm busy building an FM radio from the TDA7000, and I bought some capacitors. Now I know how to read the normal caps (eg. 104=10,0000pF.) But there are certain ones marked 5R6 and 4R7. These are not resistors, I'm not that stupid.
Please help.
Thank you.

 

audioguru

Well-Known Member

Most Helpful Member

• Mar 26, 2011

• #2

The TDA7000 is obsolete and has not been made for many years. It was replaced by a tiny TDA7088 that tunes by scanning (and it frequently misses stations). Both ICs produce radios with horrible performance.
The Dollar Store sells a "radio" with the TDA7088 IC, battery cells and a flashlight bulb for only $1.00. I got two for free and they work poorly and sound awful.

 

G

Gobbledok

Active Member

• Mar 26, 2011

• #3

hannobisschoff@gmail.com said:

But there are certain ones marked 5R6 and 4R7.

Click to expand...

They are inductors, maybe? The value is probably written in uH.

 

Last edited: Mar 26, 2011

H

hannobisschoff@gmail.com

Member

• Mar 27, 2011

• #4

I know I have not ordered inductors. But how could I check if they are maybe?

 

G

Gobbledok

Active Member

• Mar 27, 2011

• #5

Measure with an ohmmeter. If they are an inductor, they will be low resistance (a couple of ohms at the very most). If they are a capacitor they will read open circuit.

If they read 4.7 or 5.6 ohm they're resistors lol.

 

davenn

Active Member

• Mar 27, 2011

• #6

yes an R in the middle would normally be referring to a resistor 4R7 = 4.7 Ohms
a capacitor would have a u, n or p 4u7 or 4n7 or 4p7 == 4.7uF 4.7nF or 4.7pF respectively

 

B

bloki

Member

• Mar 27, 2011

• #7

R between numbers denotes decimal point for capacitances less than 10pF.

 

H

hannobisschoff@gmail.com

Member

• Mar 28, 2011

• #8

Thanks all. Just to be clear for example a 5R6 would be a 5.6 pF cap?
That's funny, because on none of the components lists there are 5.6pF caps.
But anyway, Thank you.