Month: March 2015


Multiple video game system.

Mac OS emulation of various game consoles. Automatically runs a Syphon server, allowing connection to video apps like Max/MSP.  Install games by dragging ROM files into the openEMU app.

Centipedes for Atari 2600

Real time music visualizers using OpenGL.

RF converter circuits

Notes and links.

down converters (shortwave to medium wave)

HF to CB/AM Broadcast Receive Converter kit, great for QRP!

Vectronics VEC-101k

Shortwave converter for AM radio:

40 meters to CB by vk3ye (includes BFO):


kf7lze roundup of up converters:


W9RAN Ranverter Pi:

ct1ffu upconverter:

IF converters

455kHz -> AF Converter (DRM):

Any SDR that will receive 455 KHz (or whatever the IF is) plus a R-Pi would work. The Pi would need to  boot automatically into an SDR app with the frequency set to the IF.

455 kHz BFO Kit – Receive ssb and cw on an am receiver!



IQ converters and panadapters

FST3253 is a commonly used chip for Tayloe mixers.

Babel Fish IF SDR Radio 1st IF I /Q software conversion module:

A Binaural IQ Receiver by Rick Campbell:

QSD By Ray Ring:

Thomas Nylund Tayloe detector and SDR

Softrock Lite II 06 mixer:


1KHz to 33MHz Adjustable Oscillator Module, LTC1799

RF mixer simulation in Max

Audio simulation of an RF circuit.

Screen Shot 2015-03-29 at 4.49.36 PM

The simulation serves no purpose, but its fun. There are 4 versions. I think the third one sounds best (rf-mixer-sim3.maxpat). Its interesting to hear how much spectral distortion happens from multiplying sawtooth waves.

Screen Shot 2015-03-29 at 4.46.55 PM


folder: rf-mixer


Note: please set the signal vector size to 1 (or as low as possible) and enable overdrive and audio interrupt

Screen Shot 2015-03-29 at 5.22.30 PM

Four versions:

  • rf-mixer-sim.maxpat (initial attempt)
  • rf-mixer-sim2.maxpat (uses sah~ and rate~ objects)
  • rf-mixer-sim3.maxpat (uses gate~ objects with a phasor~ clock)
  • rf-mixer-sim4.maxpat (bandpass filter on RF input)


RF circuit design



By Akira Matsuzawa at Tokyo Institute of Technology

Practical receiver/transmitter circuits:

From Analog Devices


Virtual desktops

Web browser emulations of desktops from ancient operating systems.


Chromascope Analog Video Synthesizer

By Don Slepian, 1983

More about Chromascope:
Watch Beginnings in Music  |  View More Free Videos Online at

Macbook analog TV mirroring

How to connect a new computer to an old Television

Signal path

Connect a VGA adapter to the Macbook DVI (Thunderbolt) port.

Screen Shot 2015-03-27 at 4.59.58 PM

Connect a VGA cable from the adapter to a PC-to-TV adapter. This converts VGA to video component (RCA plug) output. The sound from the Macbook can go through this adapter as well – it gets passed through to the RF modulator.

Screen Shot 2015-03-27 at 5.02.22 PM

Connect the PC-to-TV adapter, using RCA cables, to an RF modulator.


Connect a coaxial cable from the modulator to an RF transformer (75 to 300 ohms)

Screen Shot 2015-03-27 at 5.10.10 PM

Connect the 300 ohm leads of the matching transformer to the antenna input terminals of the TV.





Electronic video artists & related information.

By Chris J King


The Eye and the Ear

By Franciszka and Stefan Themerson (1944/45)