Author Topic: Low component count/basic component voltage booster (5V->14V only 2-3mA needed)  (Read 497 times)

0 Members and 1 Guest are viewing this topic.

Offline ALondaTopic starter

  • Contributor
  • Posts: 23
  • Country: se
    • Bizarre Electronics
Im working on a randomness source circuit based off of simple transistors with floating bases (breakdown effect?).

But to give enough noise amplitude, they need to run at about 14V. Bot of them running only need ~2-3mA in total.

I got a "voltage doubler" from a book, but it only outputs about 7-8V from 5V input. Its based of a simple 1kHz input to two transistors and 3 diodes.

Since I am self-taught, not schooled, I dont know how to modify or build another circuit to boost it all the way to 14V.

Im a perfectionist at heart so I am looking for a low component count, basic components circuit. Rushing off to buy a boost converter chip would feel like defeat. Likewise, using an off the shelf boost converter would feel the same.

I hope some kind soul could help me find a solution to my problem.

Thanks in advance,
/A
 

Offline mariush

  • Super Contributor
  • ***
  • Posts: 5170
  • Country: ro
  • .
Have a look at MAX1720: https://www.digikey.com/product-detail/en/on-semiconductor/MAX1720EUTG/MAX1720EUTGOSCT-ND/2705019

See page 10... voltage tripler ..Vout = 3 x Vin - 4 x diode voltage drops:  https://www.onsemi.com/pub/Collateral/MAX1720-D.PDF

look into how these charge pump ics are made if you want to make one... but really, it's less than 1$...
 


Share me

Digg  Facebook  SlashDot  Delicious  Technorati  Twitter  Google  Yahoo
Smf