|
|||||||
| Home | Forums | Rules | Articles | Store | Gallery | Blogs | Register | Donations | FAQ | Calendar | Search | Today's Posts | Mark Forums Read | Search |
| Parts Where to get, and how to make the best bits. PCB's, caps, transformers, etc. |
  |
|
|
|
Please consider donating to help us continue to serve you.
Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving |
 |
|
|
Thread Tools | Search this Thread |
11th March 2004, 09:25 PM
|
#1 |
|
diyAudio Member
Join Date: Jul 2003
Location: twin cities
|
How much current can this actually produce?
Hi again. I have seen circuits similar to this one in several places. U1 is a NE555 timer, used to invert 12V. On one website (the one I got this pic from), the author stated a max current of 280mA. That's sufficent for my needs. On the ESP site, a similar one is stated as having max current of 30mA. How much can I really expect out of one of these circuits?
Thanks. |
|
|
11th March 2004, 09:34 PM
|
#2 |
|
Electrons are yellow and more is better!
diyAudio Member
|
I have a hunch of that Rod is closer to the truth
 You can simulate this in LTSpice (freeware) and use a square wave source with a resistor in series to limiting the current. Just add a load also. Then you can see how the wave form will look like. You can also measure currents. This design to create negative voltage is rather ineffective.
__________________
/Per-Anders (my first name) or P-A as my friends call me |
|
|
|
13th March 2004, 08:50 AM
|
#3 |
|
diyAudio Member
Join Date: Mar 2004
Location: vancouver, WA
|
use this IC to invert a plus supply: ICL7662, available from www.newark.com.
Jim |
|
|
|
13th March 2004, 09:47 AM
|
#4 |
|
diyAudio Member
Join Date: Jan 2001
Location: Germany
|
Hi,
I have never measured that but I would say not more than 50 mA. ICs like the 555 can´t deliver much current. |
|
|
|
14th March 2004, 01:02 PM
|
#5 |
|
diyAudio Member
Join Date: Apr 2003
Location: Copenhagen, Denmark
|
As I recall:
I-Sink: 50mA I-Source: 100/200 mA
__________________
Free Schematic and Service Manual downloads www.audio-circuit.dk, Company: www.dupont-audio.com, Joint venture: www.DupontMantra.com |
|
|
|
14th March 2004, 02:12 PM
|
#6 |
|
diyAudio Member
Join Date: Jan 2001
Location: Germany
|
ACD nice website you got there.
|
|
|
|
14th March 2004, 04:14 PM
|
#7 |
|
diyAudio Member
Join Date: Apr 2003
Location: Copenhagen, Denmark
|
promitheus
Thanks
__________________
Free Schematic and Service Manual downloads www.audio-circuit.dk, Company: www.dupont-audio.com, Joint venture: www.DupontMantra.com |
|
|
|
14th March 2004, 05:41 PM
|
#8 |
|
diyAudio Member
Join Date: Jan 2003
Location: Fort Collins, CO
|
This question's not easy to answer unless you know what kind of ripple you can tolerate at the output, typical of any unregulated supply. Use an LDO at the output if in doubt. And, as peranders has suggested, simulate.
|
|
|
|
| Currently Active Users Viewing This Thread: 1 (0 members and 1 guests) | |
| Thread Tools | Search this Thread |
|
|
Similar Threads
|
||||
| Thread | Thread Starter | Forum | Replies | Last Post |
| Which tube? How much power can it produce? | flysig | Tubes / Valves | 3 | 19th April 2009 08:05 PM |
| How much power to produce 10KW or more | pjpoes | Solid State | 29 | 15th February 2008 03:12 PM |
| Anyone willing to produce X2-boards ? | Blitz | Pass Labs | 1 | 14th March 2005 10:24 AM |
| DIY - Produce 10 Watts in 10 minutes | destroyer X | Solid State | 43 | 16th November 2004 03:49 PM |
| Why can't sound produce light? | tomasro | Everything Else | 62 | 1st February 2004 02:00 AM |
| New To Site? | Need Help? |
| Page generated in 0.19547 seconds (32.82% PHP - 67.18% MySQL) with 11 queries |
