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Posts by doors666

i am trying to make a cmoy like thingie using ne5532 (thats all i have at hand in duals at present, might replace later). power right now is from 7815/7915. I am using r2=27k, r3=33k, r4=150k. Load is a 330R resistor. Ckt is here. Cap is presently 0.1uf for testing, will increase it later. ckt is on breadboard.I am giving a single channel an output from a sig gen. Similar ckt worked fine in ltspice.   Output pic is attached. Blue is input and red is output. Could someone...
I checked the output resistance of the 7812, its listed at around 15 milliohms while the tenergy 9v rechargeable is listed at max 1200 milliohms.   http://www.synthdiy.com/files/2006/LM7812.pdf   http://www.all-battery.com/datasheet/10001_datasheet.pdf   It doesn't look like the resistor is in the path when using a dc source as well as a battery with the amp switched on. Only the battery charging current goes through it. From 7812 to the amp, it goes through D4. From...
 I was asking about the battery as a load while charging it, not as a source. Just to test the circuit in ltspice. I guess i gotta live with option 1. I think 2 would require me to disconnect the batteries when they are charged or it might damage the batteries or would need some detection mechanism and  cutoff for batteries.
I am trying to use the charger from o2. I am  using a single battery and will be using dc input, say a 15v walwart, this is to drive a cmoy based on ne5532.  Attached is the circuit I am trying to simulate. I had a few questions about this.   1. How do I simulate a battery. What would be the approximate resistance and capacitance of a 9v rechargeable battery.   2. is it safe to switch on the amp while its charging. Can the amp be used safely while its charging.   3....
There are no mounting holes. How have you guys mounted it on the chassis. The only thing i see is the pot that can be mounted, but is that mounting strong enough to hold the pcb and the tubes. I was actually thinking of ditching the pot, but looks like i might need it... Any issues with a 100k pot. I plan to use this with 32 ohm headphones. Any particular reason why i see most of the people mounting the tube sockets on the other side.
I am eagerly waiting for the pcb for the 12au7 version.I have the cisco 0.38a supply, headphones are realistic pro30 (32 ohms) and koss porta pro (60 ohms). Chain would be PC->ODAC->B1 preamp->SSMH. I have a few doubts that wanted to clarify while I wait for the pcb to arrive. 1. Is there an error on the 12au7 schematic. why is c1 coming before r13 but c6 is coming from after r13, wont r13 act as a charging resistor for C6. Is this there on pcb also. 2. There is no earth...
Ok, I made a mistake, I see that both triodes are being used for a single channel and both the triodes in a tube are shorted to each other.. I dont understand why its done like this though.
i expect to see one tube, but in the first post of this thread, the pcb images and completed build pics have two tubes.
In the schematics, I see a single triode being used for each of the channels, but in the build pics and pcbs, I see two twin triodes 12au7 being used. what am i missing here.
I already have an O2, makes sense to still get this? Does this have tube like sound or more SS like sound?
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