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  1. CDRIVE

    How to increase 555 Timer Frequency

    I'm going to find you an beat you with a bat! :D Then everything I said originally stands. By the way R2 is not needed. Chris
  2. CDRIVE

    Stepping up voltage

    Yes, R3 is an unrealistic value. Way to high. Chris
  3. CDRIVE

    Pulse Train Detection

    Well, 150uS will be much easier to deal with in any case. ;) Chris
  4. CDRIVE

    Electric/Battery Metronome

    Damn, you read my mind! Solenoid linkage would be messy and cumbersome. Chris
  5. CDRIVE

    How to increase 555 Timer Frequency

    If he was then what you posted is true but he did specify R3. I guess we need conformation from Stu. Chris
  6. CDRIVE

    Simple transistor circuit problem

    Or he could do this. LED2 is used in place of a more expensive Zener or a 3 stack of 1N4002's or 1N914's. Chris
  7. CDRIVE

    High Frequency Preamp

    That would be dBm. ;) http://www.rapidtables.com/electric/dBm.htm Chris
  8. CDRIVE

    Pulse Train Detection

    Yup, that'll work too. ;) Chris
  9. CDRIVE

    Help needed and appreciated Battery powered heat source

    Google "LM317 Data Sheet". It should include a typical adjustable voltage output circuit. Chris
  10. CDRIVE

    Low frequency Amplifer

    The bias resistor can be split into two resistors with their common node bypassed to gnd with a cap. This maintains bias stability while removing negative signal feedback. ;) Chris
  11. CDRIVE

    Help needed and appreciated Battery powered heat source

    They also recommended a car or motorcycle battery. Is that in your plans? Chris
  12. CDRIVE

    How to increase 555 Timer Frequency

    He said that was a misprint. R3 is only 100 Ohms. Chris
  13. CDRIVE

    Pulse Train Detection

    Where did 150nS come from? Did it change from this first post? Chris
  14. CDRIVE

    230ac to 5vdc

    Put an Ammeter in line with the primary. With inductance that low I expect to see excessively high current ... especially if you shunt that 1 Ohm resistor. Chris
  15. CDRIVE

    Getting more gain from 5532 op amp?

    Bob brings up a good point. I'm not a musician but I believe the input impedance of many instrument amps are hi Z, so the drivers that feed them expect same. Chris
  16. CDRIVE

    How to increase 555 Timer Frequency

    Then you're generating a near symmetrical waveform, IE Square Wave? Chris Edit: In that case you only need to vary R4
  17. CDRIVE

    Pulse Train Detection

    The OpAmp circuit you posted is identical to the Data-Sheet's test circuit, so there's nothing wrong there. Since you want to detect a momentary loss of a pulse train try Googling "555 Missing Pulse Detector". Chris
  18. CDRIVE

    230ac to 5vdc

    Your Transformer model appears to be modeled as Coupled Inductors. Does LT Spice provide a Transformer model also? Transformer models are modeled in terms of turns ratio,coupling (k) coefficient, Rprim, Rsec. Chris
  19. CDRIVE

    230ac to 5vdc

    That xfmr indicates Pri= 50uH, Sec: 400uH. I don't think so and may be why LT Spice is upchucking without the 1Ω in the primary. The input current will be in the ozone without it. Chris
  20. CDRIVE

    How to increase 555 Timer Frequency

    Don't think Stuart needs that here but if he does a high current measuring project this will be very useful. ;) Chris
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