UK Vintage Radio Repair and Restoration Powered By Google Custom Search Vintage Radio Service Data

Go Back   UK Vintage Radio Repair and Restoration Discussion Forum > General Vintage Technology > Hints, Tips and Solutions (Do NOT post requests for help here)

Notices

Hints, Tips and Solutions (Do NOT post requests for help here) If you have any useful general hints and tips for vintage technology repair and restoration, please share them here. PLEASE DO NOT POST REQUESTS FOR HELP HERE!

Reply
 
Thread Tools
Old 30th Mar 2019, 10:17 am   #1
jonnybear
Octode
 
jonnybear's Avatar
 
Join Date: Nov 2010
Location: Cullompton, Devon, UK.
Posts: 1,169
Default Signal Injector. Highlight Pen.

Had a little time to waste the other day and spied a High Light Pen in the bin.
Using a couple of BC548 transistors and a few other components on a matrix board driven by a CR2032, works a treat.
John
Attached Thumbnails
Click image for larger version

Name:	DSC06928.jpg
Views:	150
Size:	60.4 KB
ID:	180590   Click image for larger version

Name:	DSC06927.jpg
Views:	140
Size:	61.7 KB
ID:	180591  
jonnybear is offline   Reply With Quote
Old 30th Mar 2019, 11:02 am   #2
paulsherwin
Moderator
 
paulsherwin's Avatar
 
Join Date: Jun 2003
Location: Oxford, UK
Posts: 17,723
Default Re: Signal Injector. Highlight Pen.

Very neat job.

I built one in an old remote control.
paulsherwin is online now   Reply With Quote
Old 30th Mar 2019, 10:04 pm   #3
Philips210
Octode
 
Join Date: May 2007
Location: Redruth, Cornwall, UK.
Posts: 1,525
Default Re: Signal Injector. Highlight Pen.

That looks a very useful item and a good idea recycling the pen case.
The rectangular section of the highlighter pen lends itself for various probe assemblies and could also be useful for a signal tracer, RF probe, logic probe, logic pulser, in circuit transistor tester etc.

Regards,
Symon
Philips210 is offline   Reply With Quote
Old 30th Mar 2019, 11:35 pm   #4
Refugee
Dekatron
 
Refugee's Avatar
 
Join Date: Apr 2012
Location: Worksop, Nottinghamshire, UK.
Posts: 3,917
Default Re: Signal Injector. Highlight Pen.

I would have gone one stage further and put a tactile switch behind the probe tip so that when you press it on a test point the switch powers it up.
Refugee is offline   Reply With Quote
Old 31st Mar 2019, 8:29 pm   #5
Mike. Watterson
Hexode
 
Join Date: Dec 2014
Location: Limerick, Ireland.
Posts: 472
Default Re: Signal Injector. Highlight Pen.

I've a selection of saved highlighters, possible projects in addition to injector:
KV probe for 10M DMM using 33M HV resistors, a longer highlighter.
Peak detector 1nF series, 2 x 1N60, 100K load and 1nF. Feed wobulator in, scope or DVM.
L.O. or IF sniffer, basically very low capacitance FET buffer so as to not pull off frequency.
Voltage probe / battery tester with bargraph IC, high impedance or 470 Ohms.
Electrometer probe, either Rod pentode (robust) or FET to drive DMM, more than 100M input impedance.
RF probe, logic probe, logic pulser already mentioned.

Also useful and saved are the metal tip flat highlighter style white correction pens. I suspect the dremel cutting wheel will cut of the ballpoint tip if it's a problem.
Mike. Watterson is offline   Reply With Quote
Reply

Thread Tools



All times are GMT +1. The time now is 11:19 am.


All information and advice on this forum is subject to the WARNING AND DISCLAIMER located at https://www.vintage-radio.net/rules.html.
Failure to heed this warning may result in death or serious injury to yourself and/or others.


Powered by vBulletin®
Copyright ©2000 - 2019, vBulletin Solutions, Inc.
Copyright ©2002 - 2018, Paul Stenning.