ULTRASONIC DRIVER CIRCUIT






R1  100K 1/2 watt

R2   2 ohm wire-wound 10 watt

R3   39 K 2 watt

R4   1.2 K 1 watt

R5  .1 ohm 5 watt

R6  500 to 1000 ohm wire-wound 100 watt (Simulated load, testing only)

R7 100 Ohm 5-10 watt

C1 Electrolytic Filter Cap. 10 - 50 MFD 450 Volt. Layout photo shows two. Driver does not need pure, no-ripple DC, so the filtration isn't very critical.

C2 2 - 4 MFD 200 VDC

C3  0.1 MFD 1500 VDC (testing only).

Q1  High-Voltage NPN Silicone Horizontal Output  transistor 2N6249, etc.

T1  Isolation Transformer, 120 VAC to 120 VAC  Will run on AC line, transformer is safety 
factor.

T2  AMIDON ASSOCIATES E/I ferrite core with Nylon bobbin. EA-77-500.

Layer  1 - 100 turns #24 enamel wire  on bobbin (label #1 #2)
Wind two layers of Teflon plumbers tape over first layer.
Layer 2  - 5 turns #24...Teflon tape  Feedback Winding
Layer 3 - 10 turns #20 or #22 Output winding
All turns in same direction, mark beginning and ends for polarity purposes. BLACK DOT on diagram 
signifies start of winding (1,3,5)  End of winding (2, 4, 6).
Cover all with final layer of Teflon Tape and fabricate "U - Shaped" bracket to fasten to Chassis.

Diodes: D1 - D4 Bridge Rectifier 400 - 600 Volt 6 Amp.

D5 - D6  1N4000 Series General purpose, 3 Amp. 3 - 500 PIV

The Lead Titanate Ultrasonic Transducer goes across output winding where  R6 and C3 are shown on diagram. Mounting of Transducer is next problem. Each side of transducer is silvered/tinned for electrical contact. One side is at ground potential. It feel it is best to design some kind of mounting where large surface area of disk is in direct contact with electrical contact. I don't recommend soldering directly to transducer disk.

I also believe these transducer disks can be stacked like batteries in series for greater power level, so a holder could be designed to hold two or three of them in a stack. This was what I was working on during my last experimental phase. If they are not firmly held in contact with tank surface, they will break (or crack) themselves under full power. Mounting is critical. Some recommend they be epoxied directly to tank surface, but this does not address how to make electrical contact on side facing away from the tank.

Ultrasonics must be a "black art" as far as finding out about how to do  things.

Switches, metering, chassis, box, Variac or Lamp Dimmer, depending on user's preferences,