Super-Freq

Category: Ideas

  • FM Modulator

    Here’s another interesting snippet from the Stompbox Cookbook. I was not able to get this to work. Who knows what went on in the mind of Mr. Boscorelli? Looks like the guitar signal is meant to modulate the frequency of the 7555 via pin 5. The 7555 then drives the 567, a phase lock loop,…

  • Trmming the NE570

    I found some good information on trimming the N570 to help remove unwanted distortion. The chip contains to two identical sections which are mirrored on either side. Pin 3 and 14 provide an input for a control voltage for the gain cells. Pin 8 and 9 provide a distortion trim fro the gain cells. Not…

  • Sycophant

    Here’s my take on the SHO. With crackle free knob. Adjust the value of C3 to create a range boost.

  • LM386 Gain

    I’ve playing around with the 386 Audio Amplifier. This is a really great chip. It has a lot of possibilities. Looking at all of the great circuits that use this I’ve noticed there are many different ways to set the gain. Gain is set using pins 1 and 8. With these two pins open the…

  • Stompbox PodCast

    I had fun last week recording a Podcast with my pal Joe who put together some great series of sound clips highlighting various boosters. [audio:http://super-freq.com/wp-content/uploads/2010/01/01_Podcast.mp3] Download

  • Stompbox Math and Calculators

    Here’s a great thread. I’ll need to read it a few times before it all sinks in. http://circuitworkshop.com/forum/index.php?topic=71.0

  • MosFET Range boost

    Here’s a simple idea that you will work on almost every transistor circuit out there. We’ll apply it to the MosFET boost here. Remember the gain of the MosFET boost was determined by the Drain and Source resistors. For the example circuit, as the Source resistor decreases in value the gain increases. A capacitor acts…

  • MosFET Gain

    Here’s a typical MosFET boost. The gain is roughly determined by the ratio of Drain and Source resistors. Divide the Drain resistor (Rd) by the Source resistor (Rs) to find the gain. For example if Rd = 5k and Rs = 5k the gain is 1. Use a Pot for Rs to set variable gain.…

  • MosFet Range Booster

    Here’s a quick idea for a MosFet Range Booster.

  • BB sized template

    Here’s an image of a BB sized template. I have made one of these to test it. Someone asked about it so I thought I’d post an image. This image was created at 200 PPI.

  • What’s this?

  • Ring Modu-Matic take two

    There were a few mistakes in the last version of this. Here’s an updated schematic and PCB.