Guys, let me suggest that you use an Elektor circuit for this job - very, very simple and reliable. Do a search on google for 'in-rush current limiter'. The solution has been with us for 20 years! Just execute a PFEW (Proudly Found Elsewhere' move in this case.
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great advice - i second this recommendation. i've been happily using the basic elektor circuit for years.
mlloyd1
mlloyd1
Bonsai said:
But where to find triacs of some 100 Ampere RMS ?
http://www.epanorama.net/circuits/semiconductor_relays.html
Someone here built one, and have the kindness to explain the circuit for dummies ?
http://www.epanorama.net/circuits/semiconductor_relays.html
Someone here built one, and have the kindness to explain the circuit for dummies ?
This web site has a soft-start circuit for $55.19 US dollars plus
$7.00 shipping equals $62.19! No endorsement but
pointing it out. . .might be cheaper and quicker in the long run.
http://www.41hz.com/main.aspx?pageID=151
$7.00 shipping equals $62.19! No endorsement but
pointing it out. . .might be cheaper and quicker in the long run.
http://www.41hz.com/main.aspx?pageID=151
gni said:
A £1 PIC microcontroller, mains dropper PSU for the PIC and a triac would do the job nicely.
A ramping up of the phase angle could be done very easily in software.
Electronic goldmine has 120 Volt AC relay for $1.19 (2x 10 amp contacts), and 4 x 2.5 V0lt NTC 6.5 amp thermistors for $1.00
If you add a power resistor and small relay resitor you have everything for the circuit, double the resistors if you want to do both primary windings. a lot of bang for the buck..
There is also a 90 Volt DC relay about $2, that could be used , but that would require diode(s) plus filter caps but easier to calculate delay.
controlling the primary side seems simpler than using the secondary side
If you add a power resistor and small relay resitor you have everything for the circuit, double the resistors if you want to do both primary windings. a lot of bang for the buck..
There is also a 90 Volt DC relay about $2, that could be used , but that would require diode(s) plus filter caps but easier to calculate delay.
controlling the primary side seems simpler than using the secondary side
thanks alot for your help guys without this forum and the people on it diy newby,s like myself would never experiance the plesure of sitting infront of a audio system that you have built yourself and sounds as good as any high end gear you can buy .ill post some pics as soon as its finnished .i have built so far a set of troels gravesen ekta grande speakers a ska pre with a optical volume control and am just finnishing some anthony houlton nxl400 mono blocks which are replacing my ska diy gb300 that i blew up from running too muchg bias 
Good thing there's plenty distance between you and the Ball-diy guy in the junglely up north. 
[Guugle for 874078(-1 or -11) if you fancy the Elektor thingy, you'll find razor sharp pcb layout files in just abouts any lingo that way]
[Guugle for 874078(-1 or -11) if you fancy the Elektor thingy, you'll find razor sharp pcb layout files in just abouts any lingo that way]
The must handle some current yes, but not 100 A continuous. 25 A (or even less) is surely sufficient.Ragnwald said:But where to find triacs of some 100 Ampere RMS ?
http://www.epanorama.net/circuits/semiconductor_relays.html
Someone here built one, and have the kindness to explain the circuit for dummies ?
Hi there -- I too have almost finished a pair of Ekta Grandes and also have bought Aussie Amp's NXL400.thanks alot for your help guys without this forum and the people on it diy newby,s like myself would never experiance the plesure of sitting infront of a audio system that you have built yourself and sounds as good as any high end gear you can buy .ill post some pics as soon as its finnished .i have built so far a set of troels gravesen ekta grande speakers a ska pre with a optical volume control and am just finnishing some anthony houlton nxl400 mono blocks which are replacing my ska diy gb300 that i blew up from running too muchg bias
How do these amps cope and what do they sound like, also what is your listening room size please.
Rgds Dacall
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