Search found 5 matches

by Robert
Fri Aug 15, 2008 9:24 am
Forum: General Discussion
Topic: Weston/Schlumberger Freq. Counter
Replies: 8
Views: 2141

I looked at the pestinger site and did not see anything that looks like my counter. I emailed heathkit and they were no help. The unit has three TO3 cased semis on the back panel. I may have time this weekend to open it up and check to see if they are LM309"s

Thanks for your help.

Robert
by Robert
Wed Aug 13, 2008 11:07 am
Forum: General Discussion
Topic: Weston/Schlumberger Freq. Counter
Replies: 8
Views: 2141

The only number I can find is 1255 on the front panel. I have searched AG Tannenbaum,Surplus Sales,Manualman, Manuals Plus and others.

The unit uses 7400 series ic's. Some ic's are house numbered 463-7 and 442-30. The 7 digit readout ckt board has a 1972 date on it.
by Robert
Tue Aug 12, 2008 11:29 am
Forum: General Discussion
Topic: Weston/Schlumberger Freq. Counter
Replies: 8
Views: 2141

Weston/Schlumberger Freq. Counter

Model #1255 Programmable Frequency Counter. I picked up this unit at a garage sale over the weekend.I have done an extensive web search for info but came up with nothing. None of the popular manual providers have any listings for it. Would anyone have any info? I think Weston was owned by many compa...
by Robert
Sat Jul 06, 2002 1:07 pm
Forum: General Discussion
Topic: Switch mode power supply
Replies: 3
Views: 804

Re: Switch mode power supply

Thanks Externet & toejam for your replies.
Iwill check them out later.<p>Robert
by Robert
Tue Jul 02, 2002 1:31 pm
Forum: General Discussion
Topic: Switch mode power supply
Replies: 3
Views: 804

Switch mode power supply

I have a Tamura switch mode power supply
model OVS-24J 24volts DC 16 amps. Would anyone
have a diagram for this unit and is it
possible to convert it to a 13.8 VDC supply?