Fisher CA-800 Rebuild Thread!

[Fredrik 1977]

a simple with rectifier some caps and a 7805 would do nice

 

[Bassblaster]

5V is a bit high for the LED's so i would still need the dropping resistors

 

[Fredrik 1977]

or just rectify--->cap---->apropriate resistor----> led. works too.
usually what i do. 78xx is somewhat overkill for leds?

 

[Bassblaster]

or just rectify--->cap---->appropriate resistor----> led. works too.
usually what i do. 78xx is somewhat overkill for leds?

that was my original idea but the value will change depending on how many LED's are lit at once. a regulated supply wont have that problem.

 

[Fredrik 1977]

i like using 78/79xx for various stuff so go with that. if u dont have any at hand just open the nearest clockradio, wallcharger, crappy cassettdeck or pretty much anything electronic and u have one

 

[Bassblaster]

Got some bad news. There won't be any new pics of this rebuild for probably quite some time. All the pics I have took have been with my phone and the screen broke on it last night and not just the glass cracked the LCD panel itself.

 

[Fredrik 1977]

holy.....!!! howd that happen? hard night at the pub?

man i have crashed some phones in my days! last one i accidently ran over with the lawnmower! hahah not much left of that one!

 

[Bassblaster]

holy.....!!! howd that happen? hard night at the pub?

i was walking on some icy sidewalks when i slipped and landed on it in my back pocket.

man i have crashed some phones in my days! last one i accidently ran over with the lawnmower! hahah not much left of that one!

If you want to get technical all of your phone is still there, just blown all over your yard

 

[Fredrik 1977]

haha yeah i might do a restoration thread! i need lots of glue though, and a microscope

 

[Bassblaster]

i think i got enough op-amps to try out. i have the...
NE5532P
NJM2114D
LM4562NA
i think that will be enough. i thought about getting a SMD to DIP adapter so i could play with some of the OPA op-amps, but i dont think i'll do all that.

 

[Bassblaster]

Got some bad news. There won't be any new pics of this rebuild for probably quite some time. All the pics I have took have been with my phone and the screen broke on it last night and not just the glass cracked the LCD panel itself.

Looking into getting a new screen for my phone. this thread needs more photos!

 

[Fredrik 1977]

 

[Bassblaster]

Would it be possible to modify what frequencies the bass and treble knobs change...? looks like it wouldn't be hard just change the values of the caps...but to what...
Some thinking aloud, or in text there's a 0.0033 for the treble and a 0.022 for the bass, changing the 0.022 to something like 0.015 would drop the frequency of that control. factory is 100Hz which sounds to boomy for me. something around 60Hz like a 5 band EQ would sound better..to me atleast

 

[Bassblaster]

Would it be possible to modify what frequencies the bass and treble knobs change...? looks like it wouldn't be hard just change the values of the caps...but to what...
Some thinking aloud, or in text there's a 0.0033 for the treble and a 0.022 for the bass, changing the 0.022 to something like 0.015 would drop the frequency of that control. factory is 100Hz which sounds to boomy for me. something around 60Hz like a 5 band EQ would sound better..to me atleast

Guess no one is to thrilled about that one. guess i was getting carried away with the rebuild state of mind

 

[Fredrik 1977]

well i just didnt have much to input on that one. guess the filters is made with both caps and resistors so probably need to replace more than just the caps.

 

[Bassblaster]

May this project resume! Got a new phone since i cant get a new screen for my last one. oh well this one has better macro capabilities.

 

[Bassblaster]

Metal Film VS wirewound resistors
What would be better to use to replace the burnt ones and the ones that run WAY hot. or does it not matter? i would love the use the Vishay / Dale RS series, right now every resistor im going to replace is getting Vishay / BC Components PR03 but the RS series look better and have higher tolerance.

 

[Fredrik 1977]

well it probably depends on a number of factors.
wich are the burnt ones and the hot ones?

 

[Bassblaster]

burnt ones are the headphone dropping resistors, the hot ones are the 4 R37-R40

 

[Fredrik 1977]

headphone resistors would probably benefit from metalfilm with proper W rating that is.
the other two is in the PSU? how hot are we talking here?