DIY Test Gear: Dim Bulb Limiter / Tester with Isolation - Design and Build

Design and Build a great "deluxe" Dim Bulb Limiter / Tester, with integrated Isolation Transformer, that reduces risk of shock in "hot chassis" equipment and could also save your test equipment.

In my hobby work with tube amplifiers and radios, a Dim Bulb Limiter (aka dim bulb tester, aka light bulb limiter, aka ....) is crucial to avoid destroying equipment on first power-up, in the event that there is a short inside.
I have used one that I built quite some time ago, and various viewers have asked me to show them how I built it, so this is it. I have added an isolation transformer to improve versatility, but the basic design is the same. I call this one the "Deluxe" version.
I have to warn you: playing with mains voltages can be dangerous, so be careful!

The digital voltmeter and ammeter module used is one of these:
https://www.ebay.com/itm/Digital-LCD-Dual-Display-Voltmeter-Ammeter-Panel-Current-Meter-AC-100-300V-0-50A/201561488389?epid=588887057&hash=item2eee003c05:g:86IAAOSwJMhXDz34

Enjoy.
🎛 DIY TEST GEAR
I enjoy building my own whenever possible, and have a few projects that may interest you:
https://www.youtube.com/watch?v=7buNHf6HoDw&list=PLy5M_tA9ux7KkjmWX0I0zNocg6NF33EfL

💡 RESTORATION BUILDING BLOCKS
A series of 'Restoration Building Blocks' videos on detailed steps in the restoration process of tube radios and amps:
https://www.youtube.com/watch?v=7xvTGd4ysRE&list=PLy5M_tA9ux7JSYx8z2mw303vx287LHpzf

🔬 HOW TO's
Some techniques are learnt and some are developed, and the videos in this playlist is a log of some of the things I've learnt.
https://www.youtube.com/playlist?list=PLy5M_tA9ux7K3B77iUGyLPai3RIvJOrkO

See also playlists on some completed tube radio restoration projects.

PHILIPS BX750A:
https://www.youtube.com/watch?v=i8U9Lteja5o&list=PLy5M_tA9ux7IG6XgctidGO0u0DeT3_CxF

TELEFUNKEN OPUS 2114:
https://www.youtube.com/watch?v=_HO2bjY5vuw&list=PLy5M_tA9ux7LhcZ9h9plfTFmjaM1mcifu

SABA UW-175-Z 3D:
https://www.youtube.com/watch?v=cca4i60ZLw4&list=PLy5M_tA9ux7IWL18nsrSf4RnjsuPjHC-p

GRUNDIG 1070:
https://www.youtube.com/watch?v=i4J5l0fwhko&list=PLy5M_tA9ux7JgnyYPRWOK763aJ8bg3iCI

SCHAUB-LORENZ GOLDY 58 type 3020:
https://www.youtube.com/watch?v=RSbt7qVed78&list=PLy5M_tA9ux7IBse5G--Kl89SPS9sATXfZ

BUSH VHF64:
https://www.youtube.com/watch?v=U--6JymkQ1M&list=PLy5M_tA9ux7KsvN5M48cX6cxN4jSz0s3X

GRUNDIG 3060A:
https://www.youtube.com/watch?v=7x2sK2GSYeE&list=PLy5M_tA9ux7L8e9h8lrHGREPqcgWO-YQm

TELEFUNKEN OPERETTE 8:
https://www.youtube.com/watch?v=5IsACM0mPzs&list=PLy5M_tA9ux7K3SXDv8Hu4uAyl1O7NE5dc

GRAETZ SUPER 171W:
https://www.youtube.com/watch?v=MhG-CH0gqm4&list=PLy5M_tA9ux7IjUykGE8neJSI6GUxMl2YG

LOEWE-OPTA MAGNET 3737W:
https://www.youtube.com/watch?v=ZSZBJ5sKQm8&list=PLy5M_tA9ux7J_hzDhnF8rs2c7wmgGfRlK

BRAUN ATELIER 3:
https://www.youtube.com/playlist?list=PLy5M_tA9ux7L3k5nPRvrk1aH764QRCTqE

LOEWE-OPTA TRUXA STEREO 4741W:
https://www.youtube.com/playlist?list=PLy5M_tA9ux7KhVk0KqPx0Wkh2KO_5f2fQ

GRAETZ COMEDIA 616:
https://www.youtube.com/watch?v=fwmW9k3TwNE&list=PLy5M_tA9ux7L5sAApLzV6xoYzmRNJpMW5

SABA FREIBURG W2:
https://www.youtube.com/playlist?list=PLy5M_tA9ux7IqvS-LshUGpE1D_WY6mrZe

GRAETZ MUSICA 4R417:
https://www.youtube.com/playlist?list=PLy5M_tA9ux7Ios98E59dWjwc2SRJyxwIn

Видео DIY Test Gear: Dim Bulb Limiter / Tester with Isolation - Design and Build канала Electronics Old and New by M Caldeira