Search found 15749 matches
- Sun Nov 23, 2008 1:14 am
- Forum: Everyones Projects
- Topic: 832 TWEEKS
- Replies: 202
- Views: 75216
- Sat Nov 22, 2008 6:19 pm
- Forum: Everyones Projects
- Topic: WD phono/PSU III clone
- Replies: 396
- Views: 129393
- Sat Nov 22, 2008 6:18 pm
- Forum: Everyones Projects
- Topic: 832 TWEEKS
- Replies: 202
- Views: 75216
- Sat Nov 22, 2008 3:21 pm
- Forum: Everyones Projects
- Topic: WD phono/PSU III clone
- Replies: 396
- Views: 129393
- Sat Nov 22, 2008 9:01 am
- Forum: Valves
- Topic: Heater connection for minimum hum - 6072/12ay7
- Replies: 20
- Views: 15142
- Sat Nov 22, 2008 9:00 am
- Forum: Beginners
- Topic: Relay switching circuit
- Replies: 13
- Views: 4279
I guess the diodes are to prevent back EMF, but nt sure if they are needed here, they are normally used to stop killing a transistor driver, but as this is driven by a switch not sure about the point. I didn;t use them, low voltage signal diodes are fine. I would not bother with a resistor, just use...
- Sat Nov 22, 2008 8:54 am
- Forum: Everyones Projects
- Topic: 832 TWEEKS
- Replies: 202
- Views: 75216
I think the front end of Daves 2a3 would have the circuit you want. I do feel I should point out that the output stage in question is a nice idea, but does have some drawbacks, it can ONLY work in class A, the moment one valve gets to cutoff the output degrades badly. Thats fine, if you get enough p...
- Fri Nov 21, 2008 8:04 pm
- Forum: Valves
- Topic: Heater connection for minimum hum - 6072/12ay7
- Replies: 20
- Views: 15142
But as long as the heater winding is not connected to 0v anywhere, then the AC current will still go back down the twisted pair to the windings, so will cancel. You will still have the electrostatic field, but the electromagnetic one will cancel. Eek no mustn't, heater supply must connect to circui...
- Fri Nov 21, 2008 8:00 pm
- Forum: Beginners
- Topic: Relay switching circuit
- Replies: 13
- Views: 4279
- Fri Nov 21, 2008 4:39 pm
- Forum: Beginners
- Topic: Relay switching circuit
- Replies: 13
- Views: 4279
- Fri Nov 21, 2008 4:36 pm
- Forum: Beginners
- Topic: Capacitor V Ratings and Suppliers
- Replies: 3
- Views: 3081
You can model the front of the power supply, and a single leg, then insert a current tap to simulate the other leg. I would not worry about expensive caps, worry about that later, or just bipass the last ones in the supply with film caps. Also with the tolerance of electro caps, don;t fret too much ...
- Fri Nov 21, 2008 2:22 pm
- Forum: Beginners
- Topic: Relay switching circuit
- Replies: 13
- Views: 4279
I used the tyco MT2 range for my pre, seems to have a lower minimum switching voltage than the ones WD use, (or at least used), RS have them and the data sheets, its simple enough to wire them via the selector switch to a regulated 5v supply created from the heater supply. If you want to switch the ...
- Fri Nov 21, 2008 1:17 pm
- Forum: Beginners
- Topic: Capacitor V Ratings and Suppliers
- Replies: 3
- Views: 3081
25% is a good rule of thumb, but it depends if you know what the actual peak voltage is going to be, its possible to cerate power supplies where the peak could be 50% higher than the constant value, PSD can help you with this. Another thing to check is the ripple current rating. Electrolytics above ...
- Fri Nov 21, 2008 12:10 pm
- Forum: Everyones Projects
- Topic: 832 TWEEKS
- Replies: 202
- Views: 75216
- Fri Nov 21, 2008 8:02 am
- Forum: Everyones Projects
- Topic: 832 TWEEKS
- Replies: 202
- Views: 75216
I thought the idea was to put the same signal on each grid ( G1 ) but out of phase ? It takes a little sideway thinking, but you are doing exactly that. If you imagine the setup, both cathodes tied together with a resistor (for the moment) to ground, equal anode loads (resistor or primary of transf...