EM8V Construction

CAUTION: Very high voltages are involved. Do not attempt construction unless you have adequate understanding of electronics.

CAUTION: Use of high voltage equipment is not recommended during pregnancy or if there is a heart pacer or other electronic equipment in the body.

I have modified Paul Chubbuck's notes and diagram to include the latest EM8V technololgy. The EM8V uses two separate 5 volt frequency sources, one for each coil. The coils are wired in parallel. The diagram of the EM8V assumes that a programmable frequency source such as the F165 will be used.

Note: Study the drawing before ordering parts. In many cases, 2 or more of the parts listed are needed.

Parts illustrated in the drawing

(A) 110 V On/Off switch.

(B) Two 120 V to 12 V 5 amp transformers. Part number 2230441 from Jameco is a good choice.

(C) Bridge rectifier, 25 amp at 50 V from Mouser, part number 625GBPC25005 or 625GBPC2510.

(D) 4700µF 35V 20% Capacitor Mouser part number 140XAL35V4700. A 10000µF is even better.

(E) The Bosch coil part number ZX075527P from JC Whitney works well.

(F) Bosch Platinum plug 6702. Set the gap to .008 or so.

(H) Use heavily insulated copper stranded wire GTO-15 E133573A available at neon shops and 3730 GTO sleeving to slide over wire to increase insulating value. You can also use copper spark plug wire. Use this for all high voltage wire. To secure this wire to the spark plug threads, strip about 1-1/2 inch of insulation off and divide the strands into two. Twist these two groups of strands separately and wrap them around opposite sides of the threaded part of the spark plug. Twist the two strands together tightly on other side and solder. You'll also need two 6 foot pieces of the wire to run outside the box to the phanotron tube.

(I) Twe BNC jacks for 5 volt frequency inputs. Part number 523-31-221-RFX from Mouser.

(K) and (L) High voltgage connectors for the wires to the phanotron. See Surplus Sales

(M) Phanotron bulb from Bill Cheb.

(N) Violet Ray applicator bulb You will need to devise a holder for this bulb if you choose to use one.

(O) Grounding pad for feet consists of any conducting metal plate attached to wire leading to a banana plug to be plugged into the ground jack.

(P) Darlington transistor Mouser part no.511-2N6059
and Heat sink Mouser 532-500403B00
and Transistor mounting socket Mouser 534-4603.
Use thermal conductive compound between the heat sink and the transistor.

(Q) High voltgage connectors. See Surplus Sales

(S) Terminal strip connector to provide a place to connect all the various leads. TS-305 from All Electronics.

(T) 3 inch, 12 Volt DC cooling fan. The JDR Microdevices (800-538-5000) stock number MUFFIN-12V Cooling fan is one choice. Mount it in such a way so as to cool the transistors.

(U) Two 680 ohm 1/2 watt resistors to carry the frequency to the bases of the Darlingtons.

Other supplies:

#BU-23 Insulating boots from Mueller Electric can be used on Phanotron bulb ends. They are available from Mouser.

Hidden inside the rubber insulating boot on the ends of the Phanotron are two one-hole rubber stoppers which fit in the ends of the Phanotron tube allowing the conductor to pass through the hole in the stopper while offering some protection to avoid any stress on the conductor being transferred to the point where it passes into the glass. I bought mine at a hardware store.

Some 7 quick count needlepoint mesh for the back of the instrument and to cover fan hole. Walmart has this in the crafts or sewing section.