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Everything posted by GPG

  1. http://www.lsicsi.com/ Easier to get here. HWW its AC.
  2. http://dictionary.reference.com/search?q=unique
  3. Yes they use electronic ballast. Google "electronic ballast"+dimmer
  4. Ground the emitters of the 547s if you remove strobe
  5. Still have my 74xx book (TI, '76) 04, 16 mA sink at Vout .4V max L and LS only 4mA Quite capable of driving a LED
  6. Perhaps the wires connected to U4d.e are pcking up hash from the relay closing with a load and resetting the FF. Try putting a RC filter on U4d,e inputs.
  7. I was thinking of connecting a contact from relay 1 in series with relay 2 and vice versa so yhat only one relay could be "on" at a time
  8. Most of the lag will be caused by the diode across the relay. Have you got a spare contact on each relay
  9. LM/NE555 is not an opamp, CD4047 is not a phase locked loop. A 555 will drive the piezo directly. Use a CMOS vesion for lowest current draw. There is no evidence that these devices actually repel mossies.
  10. The switch mode preregulator should hold a ~3.5V difference across Q9. To verify this lift the end of R9 that is connected to Q9. Put aload of 500 ohm 10W across C5. Disconnect Q9 collector. Power up.The voltage on C5 should now be about 3.5V. If it is, the preregulator is ok. Tracking can be verified by connecting an external (isolated) supply between the disconnected end of R9 and output negative. The voltage on C5 should track the power supply plus ~3.5V
  11. Came across this: pdfserv.maxim-ic.com/en/ds/MAX4617-MAX4619.pdf Has a spec for charge injection p6, if you are switching low lvel it looks like a bias of ~.6v minimises. 4617 is x8 addressable
  12. GPG, You are talking about charge injection between external pins of the IC No
  13. Google. Eg: http://www.zilog.com/products/partdetails.asp?id=Z86E04
  14. Charge injection can be thought of as a very small capacitor connected between the control and the switch channel. As a result the pops are related to the rise time of the control signal which can be reduced.
  15. Why stop at 3? http://www.national.com/pf/LM/LM3915.html
  16. Cannot recollect the part No of the one you mention but this should do www.atmel.com/dyn/resources/prod_documents/doc4768.pdf
  17. 2SC867, 400V, 1A, 23W. FT 8MHz 2SC867A ,520V,3A, 48W, FT 8MHZ 2SC2827, 500v, 6A 50W FT 20MHz 2SD326, 330V, 1A ,23W, FT 6.5.MHz
  18. Google 74HC4051. 3 will get you 24 channels
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