MADE IN THE USA 

OSC7.8

This is a VCR139 CRT. The pin connectors are alligator clips, so this would be easier to change the CRT. 
It has a Roman numeral face option, as well as 24-hour digital option, as shown.
This is my newest version, with embedded Wifi connection for automatically extracting the time,
day & date from network.
It also includes a GPS module as an alternate method to extract time & date from satellite.

It also has a menu option to display the Roman numeral face as in the 5" clock.

Homemade, not a commercial product. 

This measures about 5" W x 6” H x 10” D.

The clear acrylic shroud and the plexiglass base are homemade. 

The board has pots to adjust vertical & horizontal height / width, focus, astigmatism, brightness, and 

vertical and horizontal centering.

 Automatically sets for 50/60HZ. The display alternates every ten seconds between digital and analog 

style. 

Display also moves slightly every six seconds to help prevent "burn in" of the crt. The microcontroller 

and all chips are in sockets for easy replacement, and all the components are replaceable/repairable 

with some soldering skills and basic component identification. 

This "old school" tech has been salvaged from obsolescence by marrying it to new digital tech. 

It is an entirely homemade/handmade product, including the base and shroud, which I thermoform 

from plexiglass stock, and the firmware the microcontroller is programmed with, which is my own 

original code.

Below are the operating instructions. I will ship it anywhere in the world, but I cannot be responsible 

for problems and/or delays caused by customs in your country. 

International buyers, please send your address for a shipping quote. It can be set for operation on 

120VAC (U.S. standard) or 240VAC (some other countries) It is an entirely homemade novelty craft 

project from my workbench.

 Some points of interest:

  • All the components on my clocks / kits are replaceable/repairable because they are all standard size, not surface mount. 
  • The IC's or "chips" are socketed so they can also be replaced easily, by simply unplugging the chip and plugging in the replacement.
  • In many cases, I will repair the clock free for any reason if you ship it back to me - i.e., if a 
  • component fails or is damaged (except the tube(s))
  • All of my clocks use standard electric service (do not need a separate power supply) and can be set for 120VAC (U.S.) or 240VAC (others)  

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Instructions for OSC7.1:


For the quick start video please use the youtube link here:


https://www.youtube.com/watch?v=oXqGBzmSzus&t=16s


When the scope clock is plugged in, the blue led & the small led on the module should light immediately.


To start, press the "slow set" button (immediately after power on) and hold for up to three

seconds until the relay clicks and the neon bulb lights

The relay should click on, neon light should light, and in a few minutes the screen should display time.

The display will go to run mode (clock face) or "Oscilloscope clocks"


Press slow set button again to start, and use fast set & slow set to set the time. 

Toggle button will toggle the display on & off, just press once.


From the clock face screen, press slow set & toggle simultaneously to display the day & date.

From the date screen, press fast set to return to the time screen.

From the date screen, press slow set & fast set simultaneously to enter the Menu screen.

In the Menu screen, use fast set to select the line indicated by the arrow, and use slow set to

change the selection.

When the Menu settings are correct, press toggle once to exit and return to the clock face screen.


To connect the clock to your network via wifi, start from power on, unplug and wait a few minutes if it's already powered on.

From power on (blue led & led on module lit), press & hold the "toggle" button for three seconds to enter AP mode.

Use your device to look for the AP "WifiModule" on your networks.

Connect to this AP, and when connected, open your browser and type "192.168.4.1" in the address bar.

Enter your network name or SSID and your network password.

Click "Submit" button and the confirmation page should appear.

Within a few minutes, the clock should connect to the network and the neon bulb (high voltage) should light.

If the clock doesn't connect after several minutes, try resetting the chip by pressing the miniature button on the ESP32 board

marked "EN" or alternatively, just unplug the clock and wait a few minutes, then plug it back in and it should connect.

The time should appear. If incorrect, press the "fast set" & "toggle" buttons simultaneously to refresh the time.

To erase the network name & password, press and hold toggle button while powering the clock on, and release after three seconds.

Wifi should go into AP mode, allowing connection to enter new credentials.


From the clock face, press fast set & toggle simultaneously to refresh the time.


To set the sleep/wake times, press fast set & slow set, and the screen will appear for setting the "on" time.

Use fast set to choose the display on (wake) time (hours only).

Press toggle once to enter the "off" time screen.

Fast set & slow set to select the off time, and toggle once to exit to clock face screen.

Please note that in order to program a PM "off" time, you will need to pass 12:00 to get into the PM hours.


Time Zones :  


0=UTC


1 = EST 


2 = CST 


3 = MST 


4 = PST 


5 = AKST 


6 = HAST 


7 = BST 


8 = CEST 


9 = MSK 


10 = PHT 


11 = ACST 


12 = GST 


13 = AEST