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I recently acquired a Future Electronics FTC-401 transistor checker.
It was made in Japan.
i cant find a manual for it anywhere. There is a new company listed with the name “future Electronics “ but they know nothing of it.
I have attached a photo. Anyone know anything about these units or...
Hi Guys and Gals.
I have an old Farnell bench supply that is working fine, but I would like to improve the internal voltage reference. It uses a transistor/ zener CC source to drive a 5.6V zener.
I have attached the diagram. The part of the circuit I'm referring to is in the top-right side.
Is...
Hi
I copied this circuit for the DI output section for another Fender amp.
The DI transformer is on the top right corner of the page of page 6.
My question is how do I determine the right capacitor value on the input prim of the transformer. In the attached schematic they used a 0,1uF.
When I...
I have a Large power amplifier that needs repairing for a client of mine.
It's a no-name brand stereo power amplifier and uses TO-3 lateral mosfets.
It has a large 500VA toroidal power transformer as well as a smaller 60VA toroidal transformer for the relay speaker protect circuits.
The builder...
HI Guys.
I'm in need of a schematic for this Solid state guitar amplifier.
Someone's been in here and really messed things up.Any help will be much appreciated!!
Maybe another ELK solid state schematic will be close enough if you're willing to share.
Thank you!
Right, so I have just finished building my power supply. Its a 0-50V 0-4Amps bench supply.
I have an electonic DC load that can do transient tests on power supplies.
I just recently purchased this load.
How do I go about testing my power supply. I have no idea at what current rating to set...
I Know a guy who built this exact circuit 35 years ago. His power supply works to this day.
I got the schematic from him. Our layouts are different and I attribute this fact to mine oscillating and his not.
All I know is that the circuit works. I visited him about a month ago and gave it a go...
Hi
You can't "amplify" current. Thats why there is such a thing as "voltage gain" The amount of current available from an amplifier will determine its effective output Impedance which again affects the "damping factor"
Generally speaking an amplifier with a lower output impedance, is able to...
Klaus.
The resistors alone didn't do it. The capacitors alone did. BUT, i will use both as the resistors will help if for some reason the sense wires come loose from my croc clips.
On the output I have a 220uF 63V non polarised cap at the moment (C7). Should I parallel this with a 100nF cap?
The primaries aren't in series. Its just the way my friend Paul drew it. The 18V sec is just a separate winding, but there is only one Prim winding. This is one transformer. its a big ass 240VA traffo and is toroidal. I did a circuit to switch the taps automatically. Was a pain in the balls to...
KLAUS. The solution you proposed works a charm!!
The capacitors alone sorted the issue, but I will add the 100ohm resistors in parallel with the caps, as you have suggested.What wattage resistors should I use?
Also why are the caps solving this issue?
Now the bulbs are fine, but when I try a 12V...
Hi Yes this is happening at max current limit 4A. The bulbs draw more than this close to 5A.
If I turn my current limit pot down more, it worsens.
- - - Updated - - -
Here is the original circuit (source unknown), The schematic I originally posted is the one I built, and is a slightly modified...
Thanx Klaus. Will give this a shot and report back.
This is probably the best answer I've gotten from all 5 forums I'm on. Won't mention names. :) Glad I joined!
Hi
I have been woking on a bench power supply for the past two months or so.
I decided on a discrete regulator design with adjustable voltage and and current limit.
Yesterday I boxed most of it, and decided to test using a couple of parallel connected 12V car bulbs. The bulbs were flickering...
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