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A Simple Low Voltage Unregulated Boost Supply Circuit!

🕑 Added 2024-08-16 14:46:10 +0000 UTC

Comments

Scott Gilbert

Great video.... would look forward to more details in a future video, but I will build this boost circuit and experiment. Thanks!

420 honolulu

hello new to this . I am trying to do some repairs on cb radio. there is no receive and no output. any information would be greatly appreciated

tom byrne

I could not open this video...firefox, all updated...some open this did not

michael

First want to thank you, your video are very helpful to me. I am Curious as to what type of LCR meter you would recommend an entry level technician? I have seen the master Tech and I like it but I'm still unsure if it would be a good entry level way to measure and inductors, resistors, capacitors and so on. Thank you for your insight...mike

Mr Carlson's Lab

Right above your post in the videos description Bob.

bob cyber

where the schematic

Bryan hamilton

Yes I did kinda prefer the old vacuum tube mic

quantum love

I want to understand how you approach using an error amplifier to maintain the desired voltage level. Is it a good idea to start and stop oscillation by using the RST pin of a 555 timer?

Jordan Wortham

It took a lot of will power to get that 556 up there and I am jealous! The thought of moving mine exhausts me, I also have an RM556 waiting to come home, that one I am definitely not moving alone. It is easier to ask for help. I enjoy seeing the big scopes used in videos.

Aaron Brinkman

I forgot to add, my breadboard came with the usual sticky foam on the bottom, but with a metal plate, so I added copper tape all around the sides and some up the side to contact the ground rails. It was actually a surprisingly clean signal compared to the contact to the shield being removed. Also I can't recommend enough the breadboard from digikey labelled "high temp". I've smoked some serious components on this breadboard and it's completely intact

Aaron Brinkman

I usually play around with my signal Gen as a gate drive to make little boost supplies. This one was hilarious, I had a 33k 3w load resistor and my input voltage was at around 7 volts. With 2 450v 180u caps I was outputting 420V haha. Always get a kick out of super high (to me) voltages on a breadboard especially with a 555 involved. Fun little circuit to toy with

Portrayal Press

Long time Youtube viewer, just getting started with this. Would this be a good starting design to build a D cell power supply for a WW2 BC611 "handy-talky"? The original batteries were 1.5v and 103v... There are a couple of "commercial/hobbyist" power supplies out there, but they are all super noisy.

Dave Robinson

Thank you, I was figuring as much.

Mr Carlson's Lab

Hi Jim, that's exactly how it is in the circuit. The switches are to show the points I open and close as I demonstrate the circuit in the video. Thanks for your kind comment!

Mr Carlson's Lab

I have one waiting for bench time.

Mr Carlson's Lab

That circuit would require a transformer with optical feedback (or the like).

Mr Carlson's Lab

It was probing the output

Mr Carlson's Lab

Hi Robert. Just whats on the schematic at this time.

Alex Wade

Interesting! Are you going to restore a tube car radio? I would love to see that.

Dave Robinson

Curious... How would you isolate the grounds. Input isolated output? Positive ground input with negative ground output. Like the car radios you mentioned in your video.

Chris

Pat, if you click on the title of the post "A Simple Low Voltage Unregulated Boost Supply Circuit!" it will open the entire post and there you will see the attached schematic under the video description

Pat Welch

Thanks for sharing Paul! I don't see the "attached schematic".

Bill Hall

Were are you putting your scope probe to see the second trace?

Robert Thresher

Thanks Paul, is there an as built parts list? I don't have much of a junk box yet.

David Kuhn

That fan noise is not at all annoying. Don't worry about it.

Jim Vashro

Thanks for spending the time and sharing some of your 'scrapbook' circuits. When demonstrating your circuit, I believe you have the .047 uF cap shunting the FET as opposed to the circuit diagram that shows the switch open (minor issue since you go on to demonstrate the function of that cap). Thanks for the detailed explanation of how the circuit works and modifications that would make it work for higher voltages! As you were suggestion, this is a good foundational circuit to build from.

Brian Wood

Nice circuit, Paul. I feel sure it will cone in handy. Thanks for sharing.

Bill Haub

looks like a winner good timing on release as im in the invertor repair mode .my Trace invertor had a failure after 30 years trouble free use .its been a challenge to repair the Trace sw4024 as trace has been bought out and no schematics exsist to my knowledge .thanks for sharing your hard work and knowledge .

Clint Allsopp

Wow! I'm literally working on a 1955 Bel Air 12v AM Tube radio as we speak with a non-working vibrator. I saw your video on the ATR where the can was cut open and the contacts were loosened. But I have be wondering for the past few days about a solid-state version. Thank you as always Paul!