GPG

http://www.lsicsi.com/ Easier to get here. HWW its AC.

http://dictionary.reference.com/search?q=unique

Yes they use electronic ballast. Google "electronic ballast"+dimmer

Ground the emitters of the 547s if you remove strobe

This is what I mean

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

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.

Seems that way. Go solid state.

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

Most of the lag will be caused by the diode across the relay. Have you got a spare contact on each relay

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.

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

Page 7, table XI

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

The m is correct = milli = 1/1000

GPG, You are talking about charge injection between external pins of the IC No

A mixing desk is not a power amp

Frequency response

Google. Eg: http://www.zilog.com/products/partdetails.asp?id=Z86E04

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.

Why stop at 3? http://www.national.com/pf/LM/LM3915.html

Cannot recollect the part No of the one you mention but this should do www.atmel.com/dyn/resources/prod_documents/doc4768.pdf

Google BT151

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

Google 74HC4051. 3 will get you 24 channels