1: Re: Thanks, I am willing to try this... (16.47)
Posted by jea48 on 2007-01-14, 08:31:57 (71.214.202.134)
Tom, the problem may not be the manufacture's fault... Did you try to find the electrical device causing the problem? .......

2: RE: please teach me... (16.47)
Posted by 6bq5 on 2016-09-14, 19:55:19 (98.210.156.254)
One of the issues with Mains power distribution in the US is that the quality and "cleanliness" has gone down- to wit: power spikes are common, as well as sagging mains voltage DC and HF noise is on t .......

3: RE: DacMagic - DC supply instead of AC? (14.58)
Posted by zanash on 2009-07-07, 23:04:32 (86.5.5.30)
no reason ......you need to find out what the operating voltage is then regulate the dc to match ...injecting it into the curcuit beyond the rectfication stage ... alternatively ...you could attempt t .......

4: Connect and messure voltage. (13.62)
Posted by groman on 2002-01-04, 08:35:45 (213.116.249.74)
A(ampere,AC)=VA(watt)/V(voltageAC) to use the formula you need to know 2 of the values. you have the VA now get the V 1.connect a Resistor to secondary can be 1 kohm, gives 40 mA at 40 Vac need to be .......

5: Re: What is the min. AC voltage for 8V DC regulated ? (13.49)
Posted by pkell44 on 2003-12-11, 13:39:40 (4.10.64.183)
The spec sheets on the 78xx positive & 79xx negative TO-220 voltage regulators call for a minimum of 3v headroom (voltage above the stated regulated voltage output) in order to maintain a constant reg .......

6: RE: My situation may actually more complicated than this. (13.25)
Posted by jea48 on 2015-05-04, 09:44:29 (173.28.177.136)
I was thinking if I can connect the High voltage (340V) coil from first LL1669A transformer to the high voltage (340V) coil of the second transformer so that the first transformer can share the loadi .......

7: Re: Why rectify AC mains for a CDP? (nt) (13.16)
Posted by Vinnie R. on 2004-05-07, 06:52:54 (63.251.131.98)
A typical dvd/cd player today has many voltage rails. For example, 5V, 3.3V, 2.5V, 1.8V, +/-12V, negative voltages for the flourescent display like -18V and -24V, etc etc. etc. Designing it with a lin .......

8: Re: Please help with no-power nad 3020 (12.83)
Posted by poweristheanswer on 2004-10-05, 04:28:15 (202.6.138.35)
Hmm...yes step one is to make sure your meter is working correctly and testing it on a battery first (on the right setting) is a good idea. With the fault you described I would check the voltage acros .......

9: Question to Paul McGowan regarding power conditioners (12.08)
Posted by Pete Fleming on 2001-03-11, 20:02:14 (203.101.17.56)
Paul, I’ve read about your power conditioners and have been impressed by PS Audio’s accurate account of mains power problems. Fortunately 240V is used where I live, hence the “flat topping” problems a .......

10: Re: Jon, DC blocking circuit in fornt of the balanced power (11.41)
Posted by Kuei Yang Wang on 2003-05-07, 05:10:05 (213.121.212.121)
Koinichiwa, > If it is indeed the same circuit as tvi posted It is not the same, but more or less functionally equivalent. > then this has several ways to be improved in my opinion. > First, there is .......

11: RE: best power conditioner for dirty AC (11.14)
Posted by DevillEars on 2007-10-29, 10:53:48 (198.54.202.234)
If you're looking for a device that will clean up a modified square-wave and output a clean and pure sine-wave, then you're probably going to battle to find any passive line conditioner that really wo .......

12: RE: Zerozone 100VA PSU Fuse Issue (10.97)
Posted by jea48 on 2017-07-23, 15:19:10 (104.166.247.19)
P = I X E P = watts, VA (Volt Amps) I = amps E = volts Here we have a 100VA transformer. Manufacture spec 115Vac primary, 12Vac secondary. Find the max available current, in amps, the secondary wind .......

13: Did you read this one? (10.89)
Posted by jea48 on 2007-01-14, 16:27:48 (71.214.202.134)
link .......

14: Re: 50Hz power supply to 60Hz conversion (10.81)
Posted by Glenn2 on 2003-06-27, 03:41:16 (195.92.67.68)
Are you sure about this? I've only ever seen tape decks with DC capstan motors, or AC motors with a quartz reference. The AC never got beyond the transformer so 50Hz or 60Hz wouldn't matter (as long t .......

15: Auricap tweak (10.50)
Posted by Fatcobra on 2004-03-16, 15:51:25 (207.69.137.23)
-I'm referring to the Auricap cdp/AC mains tweak... I have some 250vdc ICW Clarity caps that I'd like to try. Is this voltage too low? I believe the Auricaps are rated at 600 volts DC... Thanks, Fatco .......

16: RE: Advice needed - Slight speed problem on a new Debut Carbon DC (10.42)
Posted by 6bq5 on 2015-12-11, 08:47:59 (50.200.188.134)
If the Mfger can't help - you may wish to check the AC mains - for voltage - or invest in the Phoenix Engineering RoadRunner(R), Falcon or Eagle- .......

17: AC Plug Orientation?? ... pinging JR (10.39)
Posted by andyr on 2004-08-24, 04:37:30 (203.51.166.43)
Hi, Jon, In a recent post on reversing AC polarity, you referenced some old posts of yours (.../tweaks/messages/36908.html & 36909.html). I read these posts of yours and your reference to Pete Goudrea .......

18: installing relay on mains switch - help me please (10.33)
Posted by pturn on 2003-05-27, 06:20:06 (68.166.171.178)
Hello all, I have a sonic frontiers SFL-1 which I love but it tends to send a loud pop when switching the power off, which means I have to be sure to have switched the power amp off before the pre. Th .......

19: Re: Dr. Hill’s Patent “Sound production using large volume plasmas” plus additional information... (10.13)
Posted by Prune on 2004-07-15, 03:47:06 (24.81.26.239)
I am curious what the DC bias voltage and the amplitude of the AC signal is in Hill's speakers. Obviously the AC low peak cannot be nearly much as the DC bias as the overall voltage would be too low a .......

20: You are comparing apples to oranges. (9.98)
Posted by jea48 on 2015-03-22, 09:51:00 (173.28.177.136)
The Bryston BIT5 is an isolation transformer with surge suppression protection added to the secondary load side of the isolation transformer. The steady available power of the secondary of the transfo .......

21: RE: Zerozone 100VA PSU Fuse Issue (9.87)
Posted by jea48 on 2017-07-23, 18:11:36 (104.166.247.19)
did you notice Basslines' post about the Zerozone 100VA PSU stock fuse perhaps being intended for a 240VAC application Yes, I read it. If the unit was made to be fed from 230Vac the max rated primar .......

22: Re: buzzing toroid transformers (9.45)
Posted by andyr on 2004-08-28, 02:00:17 (203.51.164.50)
Hi, zachSLC, Buzzing can be caused by several things ... I've got a total of 11 toroids in my AKSA systems; they all buzz slightly but 1 buzzes louder than the rest. This is of Chinese manufacture and .......

23: Re: OK, Evil mandarin! (9.43)
Posted by Kuei Yang Wang on 2003-05-08, 04:00:22 (213.121.212.121)
Koinichiwa, > You are on 240 VAC, right? Me iz. > In the US, any AC line offset will be halved, Maybe. Depends how distorted your mains are, much more than the actual voltage. > The presence of the di .......

24: Power Conditioner deleterious to source ? (9.23)
Posted by Tweaker on 2002-09-20, 09:57:32 (12.234.152.14)
I bought a power conditioner (meant for for the manufacture of chips, where stable voltage and absence of AC hash, and DC leakage from the mains is mandatory). I tried plugging in both pre-amplifier a .......

25: Re: Wiring transformers for proper grounding etc. ( long) (8.72)
Posted by gcherhit on 2001-01-18, 17:49:07 (209.162.64.135)
Hi Tony Let's see if we can figure this thing out. It may take a little time, but it seems like a basic mistake in the power supply wiring. Take one of your transformers and check that the primaries a .......

26: Re: Transformer hook-up question to 115V AC line (8.55)
Posted by pkell44 on 2005-08-18, 15:56:12 (68.231.140.144)
You did not say whether the terminals are connected to the Primary or secondary windings of the transformer. Since there is a " 0 " in the center of each row of terminals I would surmise that they are .......

27: Re: diode choice and psu design (8.32)
Posted by JZ on 2001-01-28, 10:20:31 (62.100.7.149)
Hi there, Thanks for the response. The reason I used two seperate rectifiers for the seperate windings is that i found that in this way I could minimise the charging spikes of the capacitators in the .......

28: Torroidal transformer hum and DC Blocker DIY (8.30)
Posted by HumanMedia on 2009-03-07, 18:37:57 (58.172.243.26)
OK I have a bad hum on two components torroidal transformers, and have long known that its probably DC on the main supply. Apart from the physical hum I'm told that humming transformers probably affec .......

29: Re: OK, Evil mandarin! (7.94)
Posted by Kuei Yang Wang on 2003-05-08, 11:21:24 (213.121.212.121)
Koinichiwa, > Then the circuit is not universal, and NEEDS to be sized according > to the exact load, mains voltages, etc. The circuit originally referenced was never intended to be universal, the cap .......

30: Use only AC-rated noise suppression caps. (7.55)
Posted by Al Sekela on 2010-08-01, 18:53:32 (76.191.156.247)
Capacitors made for AC noise suppression are designed to not generate resistive leaks when exposed to power line spikes. Other capacitors may have much higher DC voltage ratings, but may not withstand .......

31: Re: Fuse and cable directionality in power lines. (7.22)
Posted by Pete Fleming on 2001-03-27, 18:45:06 (203.101.17.56)
Good for you for trying this tweak and approaching with a critical ear. Your findings are what I would expect. As I mentioned above, there is no “backwards” position in AC. Unfortunately this seems to .......

32: Suggestions for AC/Mains/Power supplies related tweaking (7.06)
Posted by Thorsten on 2013-07-23, 04:28:44 (193.150.9.91)
Folks, As requested, from the the thread that was ghosted... First, mains voltages an kill. Second, bad installations of anything mains may cause short circuits and fires. Be safe. Never "patch on" .......

33: Re: Jon, DC blocking circuit in fornt of the balanced power (6.82)
Posted by Kuei Yang Wang on 2003-05-08, 11:56:19 (213.121.212.121)
Koinichiwa, > Don't bet on it. Current IEC standards require capacitors for this > kind of application to be tested with 24 pulses up to 12 kV. Under > surge conditions, the MOV operates by shorting t .......

34: I'm afraid both of you be wrong... (6.52)
Posted by Jacques on 2006-07-18, 03:39:17 (81.56.144.181)
(1) Germany (as most european countries and perhaps even UK!) began not by 220V AC triphase, but by 110V AC triphase. Switching to 220V was done in the '50s, and then to 230V in the '80s. (2) The 110V .......

35: Re: Isolation Transformer as Tube pre-amp power transformer !! (6.01)
Posted by Thorsten on 2001-08-01, 08:53:02 (195.99.125.204)
Hi, Yes, this is a good idea for "making do". Even better is (from a viewpoint of noise filtering) is to use a massively oversized heater transformer and then to connect a suitable transformer reverse .......

36: Back on line after a little down-time (5.20)
Posted by Larry Tate on 2001-07-29, 01:47:45 (216.9.4.7)
Hi C, Well, after two days of fighting computer problems I'm back in business. So, here goes... > What you didn't mention was if you're regulating the DC > supply, after the filter. For a headphone am .......

37: Some thoughts on tweaks carried out on the x-dac3 (4.89)
Posted by zanash on 2006-04-28, 07:23:02 (62.254.0.30)
MF –x dacv3 mods The aim was to try and improve the unit but on a strictly limited budget of about £50 for parts. The unit on initial listen sounded thin, closed in and a little congested, with fair i .......

Found total of 37 records, Query: DC +voltage +on +AC +mains in Tweakers' Asylum, Time: 1 sec.

New Search