Recent content by TzeYang
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Tiny DAC, Big Sound, Evolved – Stoner Acoustics UD100 / UD110 / UD120
https://www.facebook.com/StonerAcoustics/photos/a.689220487759500.1073741826.426811050667113/1342274039120805/?type=3&theater- TzeYang
- Post #1,140
- Forum: Dedicated Source Components
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New Stoner Acoustics Ruby Portable Amplifier
https://www.facebook.com/StonerAcoustics/posts/1197085356973008 Seems like they are having a sales for the holidays...- TzeYang
- Post #28
- Forum: Portable Headphone Amps
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HeadAmp Pico Power: Pre-Order Thread
Justin, I don't own your products because I'm too poor to afford them, but from an engineer's point of view, I really admire your work. Pure curiosity, how do you deal with the unbalanced 2x 9V batteries causing dc offset issues when they drop low? Does the amp cut off the batteries...- TzeYang
- Post #136
- Forum: Sponsor Announcements and Deals
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Post pics of your builds....
I LOVE what you did to the USB connector.- TzeYang
- Post #7,289
- Forum: DIY (Do-It-Yourself) Discussions
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Oh how I hate Eagle PCB - Any help with A47 upgrade?
try diptrace if eagle is too hard to use.- TzeYang
- Post #8
- Forum: DIY (Do-It-Yourself) Discussions
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DAC Cases and EMI/RFI stuff, Really low level question
is there noise at the first place?- TzeYang
- Post #2
- Forum: DIY (Do-It-Yourself) Discussions
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2 or 3 Channel, Single Ended Class "A" Design Thread
just so you know, these ideas are all discussed and done thoroughly before here and on headwize. Eventually, you'll end up with a PRR like MOSFET amplifier with two rails.You could add complexity to the output stage by adding a CFP, add some FETs to the rails, cap multiplier, small shunt regs to...- TzeYang
- Post #70
- Forum: DIY (Do-It-Yourself) Discussions
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2 or 3 Channel, Single Ended Class "A" Design Thread
if you're going to add an opamp anyway, why not simply build PRR's MOSFET + OPAMP combo with two rails? There's an elegance of using output caps when your circuit is that simple but if you have something that controls the output, having output caps is counter-intuitive.- TzeYang
- Post #65
- Forum: DIY (Do-It-Yourself) Discussions
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General design theory help
been busy with school. but here's a quickie. Generally, you want to have the input impedance of the non-inverting input and the inverting input to be the same. Hence, R1 || R2 = R3 || R4. This applies greatly to BJT input opamps where there is enough base current to cause dc errors.- TzeYang
- Post #17
- Forum: DIY (Do-It-Yourself) Discussions
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General design theory help
Quote: ACTUALLY, the calculation is the same. The input differential stage is self biased. Meaning that input stage current depends on how much voltage you drop across the source resistors and the IDSS curve of the device itself (this varies between devices). The VR1 is there to set...- TzeYang
- Post #14
- Forum: DIY (Do-It-Yourself) Discussions
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General design theory help
cant be sure, but here goes. correct me if i'm wrong. input impedance is dominated by R1 and R2. The input impedance of the direct input is usually VERY large, depending on the types of input transistors. In an ideal case, it is assumed to be infinity. You don't really have to look at this...- TzeYang
- Post #7
- Forum: DIY (Do-It-Yourself) Discussions
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Hakko 936 discontinued, viable replacements?
the only problem you'll probably get is the stupid plastic knob that breaks down after 2 years. Replace with aluminum knob and pretend it's hi-fi.- TzeYang
- Post #3
- Forum: DIY (Do-It-Yourself) Discussions
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Would 1.5v battery kill a headphone driver testing polarity?
but are you not heating up the drivers by applying DC across it?- TzeYang
- Post #3
- Forum: DIY (Do-It-Yourself) Discussions
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LM317 dual rail power supply
With a circuit this symmetric, consider using thicker traces and a star ground.- TzeYang
- Post #32
- Forum: DIY (Do-It-Yourself) Discussions
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PPA v2 construction discussion
lower the resistor between the buffer and the output of the opamp to about 100 ohms.- TzeYang
- Post #824
- Forum: DIY (Do-It-Yourself) Discussions