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  1. S

    Increase common mode range of INAMP??

    Hi, Just wondering if anyone knows of a nice little circuit to decrease the common mode voltage at the input to a differential instrumentation amp? I'm using the AD8555, currently working ok with a common DC level of up to about 6V. Problem is I need to measure power consumption etc on a 12V...
  2. S

    Digital trace over analog ground region

    Hi, I have a question regarding a mixed signal PCB design. I have a board with partitioned ground planes (AGND and DGND) but there is an analog IC that requires a digital control signal from the CPU that cannot be physically positioned on or near the analog/digital border. So basically I have...
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    Lithium Thynol Chloride battery issues

    thynol Hi All, Not sure if I'm in the right part of the board here... I was wondering if any of you have experience with Lithium Thynol Chloride cells? I'm having endless dramas with reliability, possibly due to passivation. I am preconditioning the cells according to the datasheet (Tekcell...
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    Controlled impedance routing in Altium Designer

    controlled impedance calculator no ground plane Hi, I'm wanting to tune the impedance of some tracks in a layout that is already complete. I have tried turning on 'characteristic impedance driven width' in routing rules, but no matter which parameters I change here or in the layer stack...
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    Parallel RLC circuit conversion

    Hi, I need to convert a high frequency inductor model from a parallel RLC circuit (all three elements in parallel) to a series RL in parallel with a capacitor. I know the resonant frequency will be the same, so for a given inductance the capacitance will be the same, but i'm guessing the...
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    Rounded corners in Protel???

    Hi, I want to route a pcb with rounded corners in Altium Designer 6 (new version of protel) and i cant seem to find any way to do it apart from using arcs... I have tried selecting 'rounded' in the corner section of the design rules, but it does nothing. This is driving me crazy!! Any ideas...
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    Any Induction Loop Geeks?

    Hi, If i was to play a guitar, take the output signal, then feed it back into the pickups via and induction loop system what would happen? I'm thinking there will probably be a huge amount of nasty feedback, but could this be tamed to provide sustain or controlled feedback? I mean, could the...
  8. S

    Identifying old transformer

    Hi, I bought an old transformer at a garage sale a while ago and was wondering if you guys might be able to help me figure out what it is. It is pretty big, about 15x15cm. The only markings are... 10-1222-A NTK 230454 On one side there are 2 blue wires and 2 grey. On the other side there...
  9. S

    LOHET1 current sensor problem

    Hi, I'm using a hall effect current sensor IC mounted in a current transformer to measure AC current via a micro. It is supposed to output an AC voltage proportional to the AC current sensed. This is all working fine, but i noticed something quite strange... The output waveform is exactly...
  10. S

    Solution to oscillating preamp issue

    Hi, I've built a guitar amp using the schematics on this site **broken link removed** It is mostly working fine, but when i flick the 'bright' switch, the opamp goes into oscillation. I've bypassed both power pins to ground with 0.1uF ceramics, and I've tried it with the power amp...
  11. S

    Low frequency oscillation problem in opamp

    Hi, I've modified a guitar pedal design to include a gain stage at the output. There was already an opamp buffer at the output, so i've just converted it to a single supply (9V) non-inverting amp. I've learnt the theory of opamp circuits at uni, but we've never really played around with them...
  12. S

    Mains voltage metering issues

    Hi, I'm working on a final year project with the aim of remotely metering mains voltages and currents in a 3-phase distrobution box. here's our setup.. step down voltages with .35VA 6V transformers, apply 2.5V offset, take 64 samples per 20ms (for 50Hz) via the ADC in an AVR ATmega16 micro...
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    Where can I get a 1:1 transformer in Australia?

    Hi, I need to measure the voltage between Earth and Neutral of a 3 phase supply. The measurement circuitry must be totally isolated, so I think I need a transformer with a 1:1 ratio to sit in between. I've checked out my local suppliers catalog and they dont seem to sell any plain old 1:1...
  14. S

    Hall effect current sensor

    Hi, I'm looking at using a Honeywell LOHET 1 current sensor to measure currents up to 32A. As far as i can tell from the data available, it produces an output voltage that varies as the magnetic field varies within the gauss range... I am no where near up to scratch with my physics, and I'm a...
  15. S

    +18V, 5V power supply help

    lm2976 Hi, I need to build a power supply with 18V and 5V DC. I seem to have 2 options... Transformer (18V)-> rectifier -> 7818 regulator -> 7805 regulator or multitap transformer -> 2 seperate rectifiers -> regulators i figure in the first case, the 7805 could get pretty hot. but in the...
  16. S

    power supply switching noise help

    Hi, I've just finished building a guitar amp, and its all working fine, except there is a horrible 100khz signal leaking through the valve pre-amp swiching power supply and appearing at the output. is there a simple way to filter this noise at the dc outputs of the psu? the outputs are 12v...
  17. S

    need help with guitar amp project

    guitar amp oscillation Hi, I've just about finished building a guitar amp, and im having strange problems with the power amp circuit. everything works fine, it amplifies the signal, and sounds good, but the amp is drawing more current from the positive rail than it is from the negative...

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