On Sat, 03 Jan 2004 01:16:14 -0500, Circuit Breaker
wrote:

Circuit Breaker wrote:

Thanks for the help, Joe - I'll let you know how it goes when I get the
chance. Right now my father's needing my help loading a trailer with

Well, I got the chance.

Worked marvellously. I now have that same 1300 foot range I had before.

Yeah, big deal, I know, but this is big for me - first "properly working",
tunable, hard-soldered FM transmitter for me that can go farther than my
bathroom.

Only problem now is getting rid of the 60-cycle hum from my homebrew power
supply. Should be simple enough, and today I added the missing .1 uF
electrolytic capacitor to the power terminals (was missing, don't know why
I never put it in before). Still have the hum though.

Not surprising. You want something *much* higher in value (a couple of
thousand uF).
--

"I expect history will be kind to me, since I intend to write it."
- Winston Churchill

Paul Burridge wrote:

On Sat, 03 Jan 2004 01:16:14 -0500, Circuit Breaker
wrote:

Circuit Breaker wrote:

Thanks for the help, Joe - I'll let you know how it goes when I get the
chance. Right now my father's needing my help loading a trailer with

Well, I got the chance.

Worked marvellously. I now have that same 1300 foot range I had before.

Yeah, big deal, I know, but this is big for me - first "properly working",
tunable, hard-soldered FM transmitter for me that can go farther than my
bathroom.

Only problem now is getting rid of the 60-cycle hum from my homebrew power
supply. Should be simple enough, and today I added the missing .1 uF
electrolytic capacitor to the power terminals (was missing, don't know why
I never put it in before). Still have the hum though.

Not surprising. You want something *much* higher in value (a couple of
thousand uF).

I posted an additional 80 lines or so in reply to this, but whether my ISP
or my newsreader is the device that's screwed up, I don't know. Getting
very irritating though, that every time I spend more than 30 seconds
typing a reply it farhques up.

Anyway...

Between the full-wave bridge rectifier and the regulator is a pair of 35-v
1,000 uF electrolytic cylinders. I considered using a 4,700 uF, but it
only sports a 16v rating (even the pair I have are only 25v). I did put
it in parallel to my radio on the outside of the supply, and it /seemed/
to help some, but I'm tired and didn't take notes. I've played with
different voltages as well, and it seems worse at higher voltages.
Thinking it might be that there is no load on the supply, I added about
300 mW (it's a 450 mW transformer) of a light bulb to the mix. Didn't
help a bit, and really heated the regulator up rather quickly.

I don't expect the circuit to be perfect, in spite of how I "sound" when I
look back over what I've typed. However, I know it's got to be incredibly
simple to fix.

Having forgotten what I typed this morning, and being irritated by how
today has flown right by and I have accomplished close to nothing, I'm
signing off soon and going to bed. Thanks for your suggestions, and I've
got some research to do on the matter this w/e.

73, de KE4EDD

--
__ ____
/ _| | _ \ Unregistered Linux User #18,000,002
| |__ | _ \
\__/ |___/ Learning is the ONLY substitution for EDUCATION!

Paul Burridge wrote:

On Sat, 03 Jan 2004 01:16:14 -0500, Circuit Breaker
wrote:

Circuit Breaker wrote:

Thanks for the help, Joe - I'll let you know how it goes when I get the
chance. Right now my father's needing my help loading a trailer with

Well, I got the chance.

Worked marvellously. I now have that same 1300 foot range I had before.

Yeah, big deal, I know, but this is big for me - first "properly working",
tunable, hard-soldered FM transmitter for me that can go farther than my
bathroom.

Only problem now is getting rid of the 60-cycle hum from my homebrew power
supply. Should be simple enough, and today I added the missing .1 uF
electrolytic capacitor to the power terminals (was missing, don't know why
I never put it in before). Still have the hum though.

Not surprising. You want something *much* higher in value (a couple of
thousand uF).

I posted an additional 80 lines or so in reply to this, but whether my ISP
or my newsreader is the device that's screwed up, I don't know. Getting
very irritating though, that every time I spend more than 30 seconds
typing a reply it farhques up.

Anyway...

Between the full-wave bridge rectifier and the regulator is a pair of 35-v
1,000 uF electrolytic cylinders. I considered using a 4,700 uF, but it
only sports a 16v rating (even the pair I have are only 25v). I did put
it in parallel to my radio on the outside of the supply, and it /seemed/
to help some, but I'm tired and didn't take notes. I've played with
different voltages as well, and it seems worse at higher voltages.
Thinking it might be that there is no load on the supply, I added about
300 mW (it's a 450 mW transformer) of a light bulb to the mix. Didn't
help a bit, and really heated the regulator up rather quickly.

I don't expect the circuit to be perfect, in spite of how I "sound" when I
look back over what I've typed. However, I know it's got to be incredibly
simple to fix.

Having forgotten what I typed this morning, and being irritated by how
today has flown right by and I have accomplished close to nothing, I'm
signing off soon and going to bed. Thanks for your suggestions, and I've
got some research to do on the matter this w/e.

73, de KE4EDD

--
__ ____
/ _| | _ \ Unregistered Linux User #18,000,002
| |__ | _ \
\__/ |___/ Learning is the ONLY substitution for EDUCATION!