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…
Bay Area DIYer’s should make it to the DIY Swap meet on Feb 21 at 924 Gilman St in Berkley CA. For more info: http://www.euthymia.org/ The first three were a great time lot’s people with lot’s of stuff. Anyone from the should meet up with me. I’ll try and wear my DIY Stompboxes t-shirt.
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
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
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…
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.…
Assume there’s your favorite booster at the input, what is D2 doing? This is the most common clipping arrangement that I have seen. It seems that D2 does nothing. If the boost at the input is running off 9V then the you should have a single that is centered on 4.5V going past the two…
Here’s a quick idea for a MosFet Range Booster.
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.
One of the Ugly Face’s that I built got a mention in the Fretboard Journal. No picture though. Which is too bad. They took a picture of a bunch of other more common name brand things. Really Tim Escobedo should have gotten a mention. The people writing these articles need to educate themselves on the…
Here’s an idea for a ring modulator. I used a 3080 for the balanced modulator from the Ring-Modu-Matic. I used an envelope, from the Meatball, to control the carrier frequency. This is untested. The controlling the FET to turn on the carrier is going to be a challenge.