the SMPS is giving out 46Vdc without the T4 connected.
everything was working the previous day so all the connections should be ok.
everything was working the previous day so all the connections should be ok.
I'm seeing that the SMPS +V and GND out as shorted (has continuity). This is not good right? By the way this is SMPS500R for Connex.
...where is the short? On T4 board or on the connex board? Can you post some photo?the connex board. Both C13 and C15 (refer here: http://www.connexelectronic.com/documents/SMPS500R.pdf are now shorted. hopefully the T4 is not damaged.
I do not own the Connex, if someone else could verify these shorts... However I see that C13 and C14 are caps terminals. It depends on the circuit topology....but for sure a shorted cap is a useless cap; however before putting your hands on the board, try to directly email Connex.
T4 board should be all right; it has some protections.
T4 board should be all right; it has some protections.
yup the T4 is alright. bought some cheap toroidal transformer a while ago as a back-up solution. now my T4 is working. immediately noticed a more defined bass with transformer power supply maybe my ears are playing tricks on me after not getting enough sleep thinking about it.
on a separate note, already reported the issue with my smps to Cristi.
on a separate note, already reported the issue with my smps to Cristi.
I have a similar problem. As in your case, the Connex500 doesn't manage to "kick" in the relay of the T4 when initially powered up. The read light is on, the green is not and the voltage out of the Connex is around 8V. Disconnected from the T4 the voltage is 48V.
However, after a while powered on (more than 10 minutes), the Connex suddenly will power up the T4 and everything is working fine. I'm not sure, but this might be due to the thermal resistor on the Connex that is designed to prevent to high current when the capacitors are beeing charged. Supporting this theory is the fact that a hairdryer pointed at the Connex helps it starts working! I have also emailed this issue to Steinar.
However, after a while powered on (more than 10 minutes), the Connex suddenly will power up the T4 and everything is working fine. I'm not sure, but this might be due to the thermal resistor on the Connex that is designed to prevent to high current when the capacitors are beeing charged. Supporting this theory is the fact that a hairdryer pointed at the Connex helps it starts working! I have also emailed this issue to Steinar.
hi guys
can i ask a quick question...
is it possible to hook a subwoofer hi-pass connection to these amps while powering some bookshelf speakers (2.1 setup).
i tried it with a t1 but that didnt work very well.
many thanks
smithie
can i ask a quick question...
is it possible to hook a subwoofer hi-pass connection to these amps while powering some bookshelf speakers (2.1 setup).
i tried it with a t1 but that didnt work very well.
many thanks
smithie
SMPS500RS-500 Protection
TORE, i just spokt with Steinar and he told me about your issue.
SMPS500RS has a lot of protections, maybe too many, and one of them prevent the power supply to operate properly.
From what you describe me, the over-current start-up protection kick-in when the power supply attempt to power on. Either the amplifier has more capacitance that the protection can handle, or there is a larger current draw during start-up. ayway, the power supply monitors the inrush current and if is too high will not start, entering in a latched over-current protection mode. to solve this, the resistor which sets this level should be increased. this is R17, can be seen in the attached image which one is it and the schematic is available here http://www.connexelectronic.com/documents/SMPS500R.pdf i suggest to increase to 22K, and not more than 47K, otherwise the protection might become ineffective in case of a short circuit at the output during start-up. I repeat, this detects only the start-up condition, for run-over-current there is another protection.
Another reason for not start-up properly could be the mains voltage value. if is too low, or too high, would not start properly. in this case, please measure the votlage values on the 2 small electrolytics which can be seen in the picture just below the blue ceramic capacitor. you can contact me by mail for more details.
TORE, i just spokt with Steinar and he told me about your issue.
SMPS500RS has a lot of protections, maybe too many, and one of them prevent the power supply to operate properly.
From what you describe me, the over-current start-up protection kick-in when the power supply attempt to power on. Either the amplifier has more capacitance that the protection can handle, or there is a larger current draw during start-up. ayway, the power supply monitors the inrush current and if is too high will not start, entering in a latched over-current protection mode. to solve this, the resistor which sets this level should be increased. this is R17, can be seen in the attached image which one is it and the schematic is available here http://www.connexelectronic.com/documents/SMPS500R.pdf i suggest to increase to 22K, and not more than 47K, otherwise the protection might become ineffective in case of a short circuit at the output during start-up. I repeat, this detects only the start-up condition, for run-over-current there is another protection.
Another reason for not start-up properly could be the mains voltage value. if is too low, or too high, would not start properly. in this case, please measure the votlage values on the 2 small electrolytics which can be seen in the picture just below the blue ceramic capacitor. you can contact me by mail for more details.
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Cristi,
I searched in vain at that URL for a similar PDF/circuit for the SMPS180QR and SMPS300R, and could not find them. Any chance of posting them for me? I want to be able to keep the power supplies operational for many years to come 🙂
Incidentally, I am impressed with the quality with which your supplies are constructed. Both the units you sent me look very good indeed, although I have been too busy to test them for the last few weeks.
.
Condensators
Does anyone know if I can use philips 22000uF 100v condensators with this board? Or will it produce to much current?
Does anyone know if I can use philips 22000uF 100v condensators with this board? Or will it produce to much current?
I read about the mod on the Italian site with the Kendeil 100v 100000uF condensators and I stumbled upon the Philips condensators for realy cheap. I got 3. 2 to use and one spare. I'm curious too.
DIY amp newbie here! So expect some silly questions 🙂. Also apologize if these have been covered in this thread (or other thread) earlier, I might have missed out.
I am thinking of buying a T4 amp. I understand the amp is recommended for 8 Ohm speakers, but I have a couple of 4 Ohm ones I would like to run as well. My speakers are full range units and I would not be needing a whole lot of watts.
My questions are:
1. Will T4 work? It's fine if I get less output watts
2. If yes, do I need to run the amp at lower voltages?
3. What would be the safe/recommended voltage for running both 8 and 4 ohm speakers? What sort of output can I expect at that voltage?
4. Is it possible to connect a potentiometer with the T4?
I am thinking of buying a T4 amp. I understand the amp is recommended for 8 Ohm speakers, but I have a couple of 4 Ohm ones I would like to run as well. My speakers are full range units and I would not be needing a whole lot of watts.
My questions are:
1. Will T4 work? It's fine if I get less output watts
2. If yes, do I need to run the amp at lower voltages?
3. What would be the safe/recommended voltage for running both 8 and 4 ohm speakers? What sort of output can I expect at that voltage?
4. Is it possible to connect a potentiometer with the T4?
1. Yes but at 90W see hifimediy.com
2. Doesn't matter.
3. Doesn't matter.
4. Yes, you can find pictures on the internet or I can mail you one.
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