Category: Power Supplies

  • 50V to 14V Regulator

    50V to 14V Regulator

    I use an external 50V power supply for my amplifiers, the ESP 120.  This gets a clean, powerful, well regulated 50V into the enclosure for the RF Pallet. In the essence of keeping everything as simple as possible, I tap off of this 50V and regulate down to 14V to power the low power circuits,…

  • Quieting the ESP120 Fans

    Quieting the ESP120 Fans

    As mentioned in the main ESP120 article, you can slow down the fans in the ESP120. This will reduce the noise from unbearable to near silent. Pictures work best but basically, you locate the 4 fan leads, and insert 15Ω resistors in series with the 4 red fan wires. Again, since the ESP120 does not…

  • Enabling the ESP120

    Enabling the ESP120

    Here’s how you turn on the ESP120 server power supply. Here’s the main ESP120 article. You will connect the three pins together. A 3-pin connector commonly used for servos in RC toys is perfect for this.        

  • HP ESP 120 Power Supply

    HP ESP 120 Power Supply

    Ok, I’ll come right out and say it: I think the HP ESP120 is one of the best 50V power supplies you can get for home brew LDMOS RF Amplifiers. There, I said it. First, there’s the price. If you stalk eBay and wait for a seller that has a bunch of these to sell,…