7MHz Transmitter with AVR Soft-keyer
In my last post, I went over the design of a Colpitts crystal oscillator design that put out a moderately clean 7 MHz…
Tag: circuit
7MHz Crystal Oscillator Design
After constructing a 40m wire dipole that works with my SDR setup, I needed to start working on a transmission system. At the…
DOD FX55B SupraDistortion – BigBuff Mod
Here’s another in a line now of DOD pedal mods. For this FX55B, I decided to go for more of a BigMuff sound.…
Class AB amplifier test
this was an attempt at designing a simple transformer-less class AB amplifier using two BJT power transistors. i setup the USB fan to…
LFO modulated simple VCF
this is a rough draft of a circuit i’ve been working on based of the Simple VCF circuit floating out there. a big…
initial test of a modulated PT2399 circuit…
a breadboard version of some PT2399 modifications i’ve been working on. there are a lot of DIY schematics that utilize the PT2399 (Magnus…
experimental PTT signaling switch…
this is an experimental circuit i threw together today. i’ve been working on getting a VOX circuit to work with the Yaesu FT-60R…
PT2399 build…
this is an older build now, but i wanted to post it while i’ve been on the subject to record the process. believe…
ngSpice: single frequency FM modulated signal generation
ever wanted to see how that 2N2222 might hold up as a linear RF amplifier? here’s a handy feature of ngSpice that i…
Boss Tremolo TR-2 w/ C4 Mod +Gain Boost
This little guy is currently on eBay. I always thought that this tremolo wasn’t bad, but the volume drop was insatiable and drove…