Made a new version of my XUM1541, specifically the C64 XUM1541-II because obviously I had to call it that. Apart from updating the hardware, I wanted to make it a bit prettier - so I made a completely optional faceplate that goes on top of it. I may make more of these designs, which is why it is being referred to as FA1.https://www.pcbway.com/project/shareproject/C64_XUM1541_II.html

TO220 form factor. DCDC from 7V to 18V input. 5V / 1.5A DC output. Low noise (20mVpp max). High efficiency (>90%). Perfect replacement of 7805 linear regulators.https://www.diodes.com/assets/Datasheets/AP62150.pdfTested at 9V, 12V input @ 5V / 1.5A output, still air.

Recently I built a series of special effects for the scenography of the play "Strange House" by Leonardo Cortez. The set design was composed of several white boxes, all identical, as if the family were moving to a new house. On the lid of one of these boxes, built like a chest, was a TV from the 80's, with manual channel selector, made with rotary selector switch. Here I share how I solved this challenge.For this tutorial, I'm guessing you already know how to install Raspberry Pi OS and how to program it in Python. But if you don't know, I recommend the step by step on the Raspberry Pi OS website itself - https://www.raspberrypi.org/software/I'll divide this tutorial into steps to make it easier to understand. First, I eliminated the rainbow screen, the default splash screen, all system startup messages, redirecting them to another console (tty3). For this, I followed the instructions of this link: https://scribles.net/customizing-boot-up-screen-on-raspberry-pi/Which are basically these:Remove any sign that you are in a computer systemRemove Rainbow Screen:Open “/boot/config.txt” as root.sudo nano /boot/config.txt Then add below line at the end of the file.disable_splash=1 Remove text message under splash image: Open “/usr/share/plymouth/themes/pix/pix.script” as root.sudo nano /usr/share/plymouth/themes/pix/pix.script Then, remove (or comment out) four lines below:message_sprite = Sprite(); message_sprite.SetPosition(screen_width * 0.1, screen_height * 0.9, 10000); my_image = Image.Text(text, 1, 1, 1); message_sprite.SetImage(my_image); Note : This is a quick and dirty method I found. It works, but there might be better way.Remove Boot Messages Open “/boot/cmdline.txt” as root.sudo nano /boot/cmdline.txt Then, replace “console=tty1” with “console=tty3”. This redirects boot messages to tty3. Remove other things Still in “/boot/cmdline.txt”, add below at the end of the linesplash quiet plymouth.ignore-serial-consoles logo.nologo vt.global_cursor_default=0 Here are brief explanations. ‘splash’ : enables splash image ‘quiet’ : disable boot message texts ‘plymouth.ignore-serial-consoles’ : not sure about this but seems it’s required when use Plymouth. ‘logo.nologo’ : removes Raspberry Pi logo in top left corner. ‘vt.global_cursor_default=0’ : removes blinking cursor.Note : The first three should be there by default, but make sure if those exist.Creating the illusion that you're really in front of an old televisionI searched on Youtube and found some videos with the boot sequence of an old TV with CRT tube. The example I used was this one: https://www.youtube.com/watch?v=V-nbvAnq65II downloaded the video using the excellent Youtube-dl tool youtube-dl https://www.youtube.com/watch?v=V-nbvAnq65I So I cut the end of the video, in the part where the TV is turned off, using Vegas Movie Studio edit tool in my Windows Computer.I rendered the new video and saved as boot.mp4 in folder /home/pi in my Raspberry Pi SD Card.So I created a new file as root:sudo nano /etc/systemd/system/splash.service I've used the following service file definition to kick off a slide show display early in the boot process with debian:[Unit] Description=Splash screen DefaultDependencies=no After=local-fs.target [Service] ExecStart=/usr/bin/omxplayer -b /home/pi/boot.mp4 StandardInput=tty StandardOutput=tty [Install] WantedBy=sysinit.target Following this instructions: https://raspberrypi.stackexchange.com/questions/48084/custom-splash-screen-videoUsing the rotary selector switch to choose channelsThe trick of this project is precisely this: use a rotary selector key to make the selection of different videos. The switch I used in the design had two poles and four positions. Any rotary key of #poles and # positions should serve. We will use only 1 pole and connect this pole to any GND pin on the Raspberry Pi.Then, I use this Python Script:#!/usr/bin/env python import RPi.GPIO as GPIO import sys import os from subprocess import Popen GPIO.setmode (GPIO.BCM) GPIO.setup(17, GPIO.IN, pull_up_down=GPIO.PUD_UP) GPIO.setup(27, GPIO.IN, pull_up_down=GPIO.PUD_UP) GPIO.setup(22, GPIO.IN, pull_up_down=GPIO.PUD_UP) GPIO.setup(23, GPIO.IN, pull_up_down=GPIO.PUD_UP) GPIO.setup(24, GPIO.IN, pull_up_down=GPIO.PUD_UP) movie1 = ("/home/pi/Videos/Movie1.mp4") movie2 = ("/home/pi/Videos/Movie2.mp4") movie3 = ("/home/pi/Videos/Movie3.mp4") movie4 = ("/home/pi/Videos/Movie4.mp4") last_state1 = True last_state2 = True last_state3 = True last_state4 = True input_state1 = True input_state2 = True input_state3 = True input_state4 = True args = '-b --aspect-mode fill --win "0,0,1279,1023"' quit_video = True player = False while True: #Read states of inputs input_state1 = GPIO.input(17) input_state2 = GPIO.input(27) input_state3 = GPIO.input(22) input_state4 = GPIO.input(23) quite_video = GPIO.input(24) # shutdown system #If GPIO(17) is shorted to ground if input_state1 != last_state1: if (player and not input_state1): os.system('killall omxplayer.bin') omxc = Popen(['omxplayer', args, movie1]) player = True elif not input_state1: omxc = Popen(['omxplayer', args, movie1]) player = True #If GPIO(27) is shorted to ground elif input_state2 != last_state2: if (player and not input_state2): os.system('killall omxplayer.bin') omxc = Popen(['omxplayer', args, movie2]) player = True elif not input_state2: omxc = Popen(['omxplayer', args, movie2]) player = True #If GPIO(22) is shorted to ground elif input_state3 != last_state3: if (player and not input_state3): os.system('killall omxplayer.bin') omxc = Popen(['omxplayer', args, movie3]) player = True elif not input_state3: omxc = Popen(['omxplayer', args, movie3]) player = True #If GPIO(23) is shorted to ground elif input_state4 != last_state4: if (player and not input_state4): os.system('killall omxplayer.bin') omxc = Popen(['omxplayer', args, movie4]) player = True elif not input_state4: omxc = Popen(['omxplayer', args, movie4]) player = True #If omxplayer is running and GPIO(17) and GPIO(18) are NOT shorted to ground elif (player and input_state1 and input_state2 and input_state3 and input_state4): os.system('killall omxplayer.bin') player = False #GPIO(24) to close omxplayer manually - used during debug if quit_video == False: os.system('killall omxplayer.bin') os.system('poweroff') player = False #Set last_input states last_state1 = input_state1 last_state2 = input_state2 last_state3 = input_state3 last_state4 = input_state4 Saving the file as televisao.py in /home/pi/Saving and converting videosAll videos have been resized to 1280 x 1024 resolution because the monitor used is at 5:4 aspect ratio (it's an old 17-inch monitor from LG). This was the most efficient solution because, for some reason, I couldn't get omxplayer to resize the videos correctly and the display was left with undesirable black bars.All videos must be saved in the same folder as they were specified in the file televisao.py (in my case /home/pi/Videos). If you want, you can save the file boot.mp4 in same folder. Just remember to change the file location in /etc/systemd/system/splash.service.Executing televisao.py at bootJust as we created the service to display the video on boot, we'll create a service to run the python script.I just follow this: https://learn.sparkfun.com/tutorials/how-to-run-a-raspberry-pi-program-on-startup#method-3-systemdsudo systemctl --force --full edit televisao.service And then, we write this:[Unit] Description=Show Retro Television After=multi-user.target [Service] ExecStart=/usr/bin/python3 /home/pi/televisao.py [Install] WantedBy=multi-user.target Enable and monitor the service with:sudo systemctl enable --now televisao.service systemctl status televisao.service Reboot and see the magic happens!!!Aesthetics To give the illusion of an old TV, I created several layers in MDF and laser cutting, using Inkscape, with the exact measurements of the fresnel lens that I found in my scraps. The selector switch received a dial with VHF channels recorded in low relief. In the rehearsal video of the play we do not see this dial, because it was under maintenance. But in the final version, he was there. The system shutdown button went disguised as the brightness adjustment of the TV. All elements were painted with variations of black, silver and brown, to match the televisions of the 80s.As soon as the video of the play is available I will share the link here. My wife and I produced several videos with making-off of the various objects of the piece and probably the ones in English to facilitate the understanding of non-Brazilians.

For rockman exe 4 and exe 5 gates/pets

OK, so you want to build a timer, emiting pulses with given interval on breadboard using NE555. Easy, right? All you need is to put your NE555 in the middle and implement astable circuit around it, like this: Looks easy? Only on the schematic ;)Trigger and Treshold should be connected, but are on the opposite side, so single jumper is not an option. What is the shortest wire you have? :)R2 should connect pin 7 either with pin 2 (over IC?) or with pin 6 (requires vertical resistor).You need power and ground on both sides.Quickly you have no idea which pins are connected without looking into schematic ;)Finally you ends with something like this: Maybe is there any easier way? Maybe some adapter?AdapterThis adapter implements common wiring for NE555 astable circuit, exposing pins for external R1, R2 and C1, and of course for VCC, GND and output. Additionally exposes pin for Control, but allows also to solder fixed C2 capacitor. Some pins are duplicated, making it easier to connect and allowing to choose most comfortable pitch.Comparison:BenefitsTrigger and Treshold are internally connected and exposed as TRIDistance between R2 terminals can be 7.62mm, 10.16mm or 12.7mm (3, 4 or 5 holes on breadboard) making it easy to connect with horizontal resistorIt's possible to connect to VCC/GND only from one side (as above)Pins are labelled

Just a simple board - you need fuse holders: https://s.click.aliexpress.com/e/_ActhfU (make sure you get the "mini" style) and some terminal blocks: https://s.click.aliexpress.com/e/_9hxq4w (4 pin) and you're off to the races!

hat brim board with lighting and serial communications bus

This part willreplace the cardboard interface circuit board shield used in some TM501 mainframes.Often the original part is damaged or missing, so this is a direct replacement.If your unit did not have it installed, 2 brackets will need to be fabricated from aluminium, as shown in the images.The size of the brackets is not strictly critical, just try to get it close.https://www.youtube.com/watch?v=3qgTpMnht8I

A board to teach about capacitor charging and discharging. Select a cap with jumper, press button. Cap charges and lights LED during discharge phase.

the project is a cable detector. with analog delivery, and pulse detection for mounting on datalogger equipment

I attached a word file in the zip file for impedance control.

REQUIRES HEATSINK OR WATER COOLER! This is a board that holds 25 "HL-C3535F77W1EA(Ra1)-FC(5665K-6530K)" LED's in a 5S5P configuration. It requires an external 13-16V DC constant current power supply which is regulated to a max of 1.75A.

CGTR COMMODORE AMIGA COASTER V2 Hello, This is another version of CGTR Commodore Amiga Coaster Diameter is 99mm This version have some metallic parts at the ball side.You can see the first version from here:Many thanks to designer artist Esref KAYINhttps://www.esrefkayin.com/Ps. Silkscreen print may have some defects.Gerber files can be changed at any time. Before paying for the PCBs, be sure to update your orders!Have funThank you.

Designed to work with a 12V battery so if the light goes out you can still open the mechanism. It has a 5V power supply and when the button is pressed an NE555 timer sends a signal for 5 seconds to the optocoupler and relay to activate the solenoid and buzzer. In this way the dorr can remain unlocked for 5 seconds and the buzzer will let you know when it is activted.