I own a wireless guitar system that operates at 170.245 MHz. My
transmitter broke, but the receiver still works. I am looking for
schematics for a simple transmitter of the same frequency that will
accept a High Z guitar signal and will broadcast about 100 to 150 feet.
Any ideas appreciated.

Have you looked into fixing the broken transmitter? Probably would be lots
easier than finding a suitable replacement... assuming that it's not potted
or just a microcircuit under a blob of epoxy.

Barring that, is the transmitter AM or FM? if it's FM, how much deviation
does it require? What's the audio signal level from the guitar? What kind
of pickup(s) does it have?

--
Dave M
MasonDG44 at comcast dot net (Just subsitute the appropriate characters in
the address)

Never take a laxative and a sleeping pill at the same time!!
wrote in message
ups.com...
I own a wireless guitar system that operates at 170.245 MHz. My
transmitter broke, but the receiver still works. I am looking for
schematics for a simple transmitter of the same frequency that will
accept a High Z guitar signal and will broadcast about 100 to 150 feet.
Any ideas appreciated.

wrote:
I own a wireless guitar system that operates at 170.245 MHz. My
transmitter broke, but the receiver still works. I am looking for
schematics for a simple transmitter of the same frequency that will
accept a High Z guitar signal and will broadcast about 100 to 150
feet. Any ideas appreciated.

Buy a new system for $100 and you'll have a spare receiver.

http://www.music44.com/X/product/ATW-201G.T3-SH

In article . com,
wrote:
I own a wireless guitar system that operates at 170.245 MHz. My
transmitter broke, but the receiver still works. I am looking for
schematics for a simple transmitter of the same frequency that will
accept a High Z guitar signal and will broadcast about 100 to 150 feet.
Any ideas appreciated.

Not knocking the DIY approach, but given the price of these things new it
would have to be a labour of love...

--
*If only you'd use your powers for good instead of evil.

Dave Plowman London SW
To e-mail, change noise into sound.

wrote in message
ups.com...
I own a wireless guitar system that operates at 170.245 MHz. My
transmitter broke,

How? Transmits carrier but no audio? No carrier or audio? Totally dead?
Drove over it in the car? If it's anything but the latter it could well be
fixable, especially if you are competent enough to consider building one!


but the receiver still works. I am looking for
schematics for a simple transmitter of the same frequency that will
accept a High Z guitar signal and will broadcast about 100 to 150 feet.
Any ideas appreciated.


Forget it. Building a small transmitter with rock steady frequency,
spectrally clean output, wide modulation sufficient for hi fi sound quality,
properly matched to a guitar pickup, reliable and with very low power
consumption in not trivial for anyone but an experienced designer. Even then
it would be a fairly big project.

Not to mention that in many/most countries such a home made unit would
breach radio licensing regulations.

Sure, there are designs for quick and dirty wireless 'bugs' which will
transmit an audio signal, some with quite good fidelity, onto an FM
broadcast receiver.
However, these are simple free running oscillators which drift like a drifty
thing and throw out a lot of RF dirt.

There's only two satisfactory ways of achieving satisfactory results IMO-
get the transmitter repaired, either professionally or by someone competent,
or buy a new one.

Why not post details of the fault here? Maybe we can offer some help fixing
it.

Dave

Okay, folks, thank you for the feedback. Having read your input, I have
decided to simply buy a new unit. The transmitter was broken by me
while trying to do a simple repair, and I would rather not bring
humiliation upon myself for having tried to fix it in the first place.
In short, the soldering iron made the unit go from one broken
connection to a solder mess with no beginning or end. I'll save my
money and get a new one, or a good second-hand one. Thanks again.
Dave D wrote:


wrote in message
ups.com...
I own a wireless guitar system that operates at 170.245 MHz. My
transmitter broke,
igns for quick and dirty wireless 'bugs' which will
transmit an audio signal, some with quite good fidelity, onto an FM
broadcast receiver.
However, these are simple free running oscillators which drift like a drifty
thing and throw out a lot of RF dirt.

There's only two satisfactory ways of achieving satisfactory results IMO-
get the transmitter repaired, either professionally or by someone competent,
or buy a new one.

Why not post details of the fault here? Maybe we can offer some help fixing
it.

Dave

lectricmania wrote:
I would rather not bring
humiliation upon myself for having tried to fix it in the first place.

No problem - that is how we learn. Sometimes the lessons are more
expensive than yours was...so be grateful for that.

"lectricmania" wrote in message
oups.com...
Okay, folks, thank you for the feedback. Having read your input, I have
decided to simply buy a new unit. The transmitter was broken by me
while trying to do a simple repair, and I would rather not bring
humiliation upon myself for having tried to fix it in the first place.

I've dropped some right clangers in my time, like cracking the screen on a
£1000 laptop I was repairing when I fell off the chair ;-) Humiliation is
part of electronics!

In short, the soldering iron made the unit go from one broken
connection to a solder mess with no beginning or end.

So you buy a cheap solder sucker, a few quid/bucks/euros/whatever, remove
the solder in the area where it flooded and start again!

I'll save my
money and get a new one, or a good second-hand one. Thanks again.

You might as well try and repair the old one, what have you got to lose? If
nothing else you'll get some practice at soldering.

Dave

There is a very small rectangular 'jumper?' that was fried. I do not
know what they are, but all circuit boards seem to have them. Diode,
resistor, whatever it is, it is destroyed. Can I jumper across with a
wire?

Robert

lectricmania wrote:
There is a very small rectangular 'jumper?' that was fried. I do not
know what they are, but all circuit boards seem to have them. Diode,
resistor, whatever it is, it is destroyed. Can I jumper across with a
wire?

Most likely it isn't a jumper, it is a component.

The answer is no.

"lectricmania" wrote in message
oups.com...
There is a very small rectangular 'jumper?' that was fried. I do not
know what they are, but all circuit boards seem to have them. Diode,
resistor, whatever it is, it is destroyed. Can I jumper across with a
wire?

Robert


No, don't jumper across it under any circumstances. Can you describe the
component exactly? Size, appearance, how many 'legs', is it a wired
component or is it surface mount? Where in the circuit is it located? Near
the aerial, near the battery leads/contacts, near the audio in?

If it is a resistor, chances are it burned up because of a shorted
transistor, IC or capacitor etc.

If you have webspace, is there any chance you could put the unit on a
scanner and upload it? A digital camera will do but a scanner gives a much
better image with PCBs IMO. A scan of both sides of the PCB would be great.

If you don't have webspace, I can give you an email address you can send the
image to.

Dave

lectricmania wrote:
There is a very small rectangular 'jumper?' that was fried. I do not
know what they are, but all circuit boards seem to have them. Diode,
resistor, whatever it is, it is destroyed. Can I jumper across with
a
wire?

Most likely it isn't a jumper, it is a component.

The answer is no.

"lectricmania" wrote in message
oups.com...
There is a very small rectangular 'jumper?' that was fried. I do not
know what they are, but all circuit boards seem to have them. Diode,
resistor, whatever it is, it is destroyed. Can I jumper across with
a
wire?

Robert


No, don't jumper across it under any circumstances. Can you describe
the
component exactly? Size, appearance, how many 'legs', is it a wired
component or is it surface mount? Where in the circuit is it located?
Near
the aerial, near the battery leads/contacts, near the audio in?

If it is a resistor, chances are it burned up because of a shorted
transistor, IC or capacitor etc.

If you have webspace, is there any chance you could put the unit on a
scanner and upload it? A digital camera will do but a scanner gives a
much
better image with PCBs IMO. A scan of both sides of the PCB would be
great.

If you don't have webspace, I can give you an email address you can
send the
image to.

Dave

On 19 Sep 2005 17:59:15 -0700, "lectricmania"
wrote:

There is a very small rectangular 'jumper?' that was fried. I do not
know what they are, but all circuit boards seem to have them. Diode,
resistor, whatever it is, it is destroyed. Can I jumper across with a
wire?

Robert

Possibly a semiconductor/SS fuse?

Tom

I can photograph it and post it somewhere in a couple of days. I have
to go out of town tomorrow, but only overnight. I'll post the web
address here after I post the picture (probably at flickr.com or
yahoo). The unknown component is about .5 mm by 1 mm in size, and it
sticks out about .5 mm from the board. It is silver-colored at each end
and black in the middle, and it only connects in one place at either
end, like a jumper. I have no idea what those things are, but there are
several of them on the back side of the circuit board.

Robert

"lectricmania" wrote in message
oups.com...
I can photograph it and post it somewhere in a couple of days. I have
to go out of town tomorrow, but only overnight. I'll post the web
address here after I post the picture (probably at flickr.com or
yahoo). The unknown component is about .5 mm by 1 mm in size, and it
sticks out about .5 mm from the board. It is silver-colored at each end
and black in the middle, and it only connects in one place at either
end, like a jumper. I have no idea what those things are, but there are
several of them on the back side of the circuit board.

Robert


That sounds like a surface mount resistor. It may be difficult to impossible
to repair without a schematic, but I'll have a look at the picture anyway
when you post it. It is sometimes possible to arrive at a suitable resistor
value using "suck it and see" techniques, and by using an educated guess by
examining the circuit. However, this resistor certainly did not fail on its
own, there will be damage elsewhere as well.

Dave

Dave D wrote:
That sounds like a surface mount resistor. It may be difficult to
impossible to repair without a schematic, but I'll have a look at the
picture anyway when you post it. It is sometimes possible to arrive
at a suitable resistor value using "suck it and see" techniques, and
by using an educated guess by examining the circuit. However, this
resistor certainly did not fail on its own, there will be damage
elsewhere as well.

Not to be negative, but....

The OP doesn't have a schematic, and doesn't have SMT skills or tools.

Good luck.

"Travis Jordan" wrote in message
...
Dave D wrote:
That sounds like a surface mount resistor. It may be difficult to
impossible to repair without a schematic, but I'll have a look at the
picture anyway when you post it. It is sometimes possible to arrive
at a suitable resistor value using "suck it and see" techniques, and
by using an educated guess by examining the circuit. However, this
resistor certainly did not fail on its own, there will be damage
elsewhere as well.

Not to be negative, but....

The OP doesn't have a schematic, and doesn't have SMT skills or tools.

Good luck.



I know, it's probably a dead loss.

Dave

In article ,
Travis Jordan wrote:
The OP doesn't have a schematic, and doesn't have SMT skills or tools.

Does *anyone* have SMT skills? ;-)

--
*How do you tell when you run out of invisible ink? *

Dave Plowman London SW
To e-mail, change noise into sound.

Yes I have SMT repair skills. The Navy Depot repair facility where I
work at regularly trains and certifies techs in micro-miniature soldering
and repair tools and skills. We all must pass a pretty difficult test in
order to retain our certs and remain on the bench.

--
Dave M
MasonDG44 at comcast dot net (Just subsitute the appropriate characters in
the address)

Never take a laxative and a sleeping pill at the same time!!
"Dave Plowman (News)" wrote in message
...
In article ,
Travis Jordan wrote:
The OP doesn't have a schematic, and doesn't have SMT skills or tools.

Does *anyone* have SMT skills? ;-)

--
*How do you tell when you run out of invisible ink? *

Dave Plowman London SW
To e-mail, change noise into sound.

DaveM wrote:
Yes I have SMT repair skills. The Navy Depot repair facility where I
work at regularly trains and certifies techs in micro-miniature soldering
and repair tools and skills. We all must pass a pretty difficult test in
order to retain our certs and remain on the bench.

I think I've now heard everything.....

You don't even know what it is, but you can solder it?

jak

On Thu, 22 Sep 2005 14:38:23 -0500, jakdedert
wrote:

DaveM wrote:
Yes I have SMT repair skills. The Navy Depot repair facility where I
work at regularly trains and certifies techs in micro-miniature soldering
and repair tools and skills. We all must pass a pretty difficult test in
order to retain our certs and remain on the bench.

I think I've now heard everything.....

You don't even know what it is, but you can solder it?

jak

Not the original poster...

Tom

Tom MacIntyre wrote:
On Thu, 22 Sep 2005 14:38:23 -0500, jakdedert
wrote:


DaveM wrote:

Yes I have SMT repair skills. The Navy Depot repair facility where I
work at regularly trains and certifies techs in micro-miniature soldering
and repair tools and skills. We all must pass a pretty difficult test in
order to retain our certs and remain on the bench.


I think I've now heard everything.....

You don't even know what it is, but you can solder it?

jak


Not the original poster...

Tom

Oh...my bad.

jak

Folks, I appreciate all of the replies, and I appreciate your patience
with this newbie. I'm just going to buy a new one. I can play my guitar
during the hours I will save. Thanks again.

robert