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 frequency sources, one for each coil. The coils are wired in parallel. The unit can also be run with one of the bulb wires disconnected for even greater magnetic and electrical fields. The diagram of the EM8V assumes that a programmable frequency source such as the F165 will be used, so the internal 555 timer circuits, the internal/external switch, the set/run switch, the frequency counter, and the pin jacks for the frequency counter are not shown.

It can also be built with two 555 timer circuits built into the housing. For the diagram of the 555 circuit, click here.   For a diagram of the set-run and internal-external switches click here.  That diagram is of the EM7V setup but it can be adapted to the two frequency EM8V version.

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 (hardware store or Radio Shack)

(B) 120 V to 12 V Transformers -- Marlin P. Jones (800-652-6733) has the 4 amp 12 volt (6-0-6) stock number 7840-TR. They also stock the 10 amp
12-0-12 stock number 7846-TR. The 10 amp model is much larger and heavier and requires a larger box. The 5 amp TX-125 from All Electronics works well

(C) Bridge rectifier, 25 amp at 50 V Radio Shack part no. 276-1185 or Mouser part number 625GBPC25005 or 625GBPC2510.

(D) 4700µF 35V 20% Capacitor Radio Shack part no. 272-1022 or 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 4214. Bend the prong in to provide a gap of .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, 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) BNC jack Radio Shack no. 278-105 to plug in frequency generator. As a frequency source, the programmable F165 is recommended. See You will also need a BNC to BNC cord to connect the F165 to your EM8V (Radio Shack part no. 278-964). Those preferring the 555 timer circuit may follow instructions at In that case, simply wire the output signal of those circuits into this diagram in place of this BNC jack.

(J) Banana jack carrying high voltage for the phanotron. CAUTION: most banana jacks will not tolerate the high voltgage if mounted on sheet metal. They will arc. Radio Shack part no. 274-661

(K) Banana jack for plugging in the ground plate. Radio Shack part no. 274-661

(L) Banana jack carrying high voltage for the phanotron. Radio Shack part no. 274-661

(M) Phanotron bulb

(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
and thermal conductive compound Radio Shack part no. 276-1372. Use the compound between the heat sink and the transistor.

(Q) Banana plugs Radio Shack part no. 278-321 or something similar.

(R) 50 k Ohm potentiometer Radio Shack part no. 271-1716.

(S) Terminal block connector Radio Shack part no. 274-670 to provide a place to connect all the various ground leads.

(T) 3 inch, 12 Volt DC cooling fan. The JDR Microdevices (800-538-5000) stock number MUFFIN-12V Cooling fan is one choice. Similar fans are also available at local Radio Shack stores. Mount it in such a way so as to cool the transistors.

(U) Two 680 ohm 1/2 watt resistors (Radio Shack part number 271-1117) 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 serve to both protect bulb and insulate connections. They may be purchased from Radar Electric, Inc. in Seattle. Phone (206) 282-2511 FAX (206) 282-1598

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.