Search found 9 matches

by marc4g
Sun Jan 25, 2015 10:58 am
Forum: Nuts & Volts Magazine Discussions
Topic: Solar Charge Controller
Replies: 3
Views: 7032

Re: Solar Charge Controller

This could be a nit, but the only load on the 7805 is the uP.

The 7805 VR requires a minimum load of 5ma (1K) to guarantee regulation specs.

I do not know what the load presented by the uP is, but is it 5ma?
by marc4g
Sun Jan 25, 2015 10:24 am
Forum: General Discussion
Topic: circuit to replace battery
Replies: 16
Views: 7864

Re: circuit to replace battery

AT power supplies are even easier to use but for the most part, most of the power is in the 5V supplies, the 12V supplies were not much more than an amp or two. My 'small' $3.00, 150W ATX PS from Good Will is rated for 17Amps at 12v. If P=IE, I suppose you could get some what higher current from a ...
by marc4g
Wed Jan 21, 2015 3:26 pm
Forum: Nuts & Volts Magazine Discussions
Topic: January 2015 Arduino-based Master Clock
Replies: 11
Views: 6829

Re: January 2015 Arduino-based Master Clock

IBMJunkman wrote:Large images of the clock backs.

http://www.myimagecollection.com/clocks/
Thanks, this image makes it all clear!
by marc4g
Wed Jan 21, 2015 3:23 pm
Forum: Nuts & Volts Magazine Discussions
Topic: January 2015 Arduino-based Master Clock
Replies: 11
Views: 6829

Re: January 2015 Arduino-based Master Clock

I have a 1940 RCA tube manual and one of the 1st tubes in the thing is a 0A4-G gas triode. Looks like it basically a neon bulb with a control grid! The idea was to bring the 'starter anode' just up to the 'required breakdown' voltage. A voltage divider of 10k/(15k+10K) *117vac would give 46Vrms (66v...
by marc4g
Tue Jan 20, 2015 10:49 pm
Forum: Nuts & Volts Magazine Discussions
Topic: January 2015 Arduino-based Master Clock
Replies: 11
Views: 6829

Re: January 2015 Arduino-based Master Clock

These clocks are starting to make sense to me now. They look like older versions of the Simplex Analog Clock with the solenoid control (red wire). It looks like they are still around. Instead of a control input on the 'red' wire. (The other 2 are 120v (Black) and Neutral (White)) you inject a signal...
by marc4g
Tue Jan 20, 2015 5:50 pm
Forum: Nuts & Volts Magazine Discussions
Topic: January 2015 Arduino-based Master Clock
Replies: 11
Views: 6829

Re: January 2015 Arduino-based Master Clock

Len: Wow, Do you happen to know the PN for these old time 'SCRs' ? Do you have any more details on how the system worked? The detail on the attachment was too pixelated for me to make out a lot of the detail in the schematic. Before I retired, I worked at the University of Washington in Seattle as a...
by marc4g
Tue Jan 20, 2015 11:55 am
Forum: Nuts & Volts Magazine Discussions
Topic: January 2015 Arduino-based Master Clock
Replies: 11
Views: 6829

Re: January 2015 Arduino-based Master Clock

According to my 1953 Sylvania Tube manual, the 6L6 is a Power Pentode.

Are there any schematics actually showing how the 6L6 is used?

The attached schematic seems to show a gas filed full wave rectifier of some type. (Similar to a 6X6 ?)
by marc4g
Fri Jan 02, 2015 12:13 pm
Forum: General Discussion
Topic: circuit to replace battery
Replies: 16
Views: 7864

Re: circuit to replace battery

One option you may want to consider is a new or used ATX power supply. I got one at Good Will for $3.00. If you want a new one, the cost may go up to $30 or so. The smallest ATX supply should give you more than enough current. There are all sorts of wiring diagrams for these things on line. I just h...
by marc4g
Fri Dec 20, 2013 10:13 am
Forum: Nuts & Volts Magazine Discussions
Topic: Build a PIC-Based Remote Temp Sensor
Replies: 14
Views: 32443

Build a PIC-Based Remote Temp Sensor

Hello: In this month's issue, the article by Ryan Clark refs. to temperature_transmitter.c. I am new to PIC programming, but should there not be a file posted on /index.php....Clarke? Marc "BUILD A PIC-BASED REMOTE TEMPERATURE SENSOR By Ryan Clarke Post comments on this article and find any associat...