DRSSTC II System
DRSSTC II in action. Arcs are approximately 40-60".
Introduction
There were many problems associated with the operation of DRSSTC I. The DRSSTC II
system was built to address these problems and hopefully solve them.
DRSSTC Photo Gallery I - Big Arcs
DRSSTC Photo Gallery II - Big Arcs
DRSSTC Photo
Gallery III - Big Arcs
DRSSTC II : "A Modern Day Solid State Tesla Coil Experiment" Book
This 110+ page FULL COLOR publication documents my complete work with DRSSTC I and DRSSTC II
solid state Tesla Coils. Includes full schematics, parts lists, simulation data, actual test data, and numerous
diagrams. Over 60+ FULL COLOR photographs including 25 FULL SIZE, FULL COLOR spark photos!
$20.00 Each (Books can be ordered on home page through PAYPAL link)
$4.00 Shipping (US)
Contact me for international shipping pricing.
DRSSTC II with new primary and new toroid. (3D Solid Edge Model)
Primary Design
Improved Primary Coil with new strike rail (3D Solid Edge model)
Introduction goes here.
Primary Specifications:
12" Diameter Solenoid Winding
10 Turns of 0.25" Copper Tubing
0.25" Conductor Spacing
Upper Strike Rail (to protect against secondary strikes)
| # Turns | Series L (measured) | Series R (measured) |
| 1 | 1.0 uH | TBD |
| 2 | 2.2 uH | TBD |
| 3 | 5.8 uH | TBD |
| 4 | 9.0 uH | TBD |
| 5 | 12.4 uH | TBD |
| 6 | 15.6 uH | TBD |
| 7 | 20.6 uH | TBD |
| 8 | 23.7 uH | TBD |
| 9 | 28.7 uH | TBD |
| 10 | 33.7 uH | TBD |
Secondary Design
(Dimensions in inches)
Secondary Specifications:
6.5" Diameter Foam Core PVC Coilform
25" Winding Length
26 AWG Magnet Wire
Approx. 1350 Turns
Ls = 74.40mH (measured)
Rs = 95.84 ohms (measured)
Fres = 160kHz (measured)
DC Bus
The DC Bus provides the instantaneous energy (current) required by the DRSSTC during each pulse. During the ON time, the high
current is supplied to the primary coil directly from the DC storage capacitor. During the OFF time, the DC storage capacitor is
charged up again by the input AC power which is fed through a large bridge rectifier.
DC Storage Capacitor Specifications:
Vishay-Sprague Powerlytic 36DX
3500uF rated at 450VDC
Primary Capacitor Design
The primary capacitor will be a MMC capacitor type and comprised of an array of 0.33uF polypropylene capacitors rated at
2000V each. The capacitors are GE part number 42L3332. For my initial design, the capacitance value of my primary
capacitor was chosen according to the following relationship:
Primary Fres = Secondary Fres
The Primary Fres was calculated by assuming only 8 turns (23.7uH) of the primary coil were used. This allows me to have
plenty of headroom on the primary coil to tune in either direction from 1 turn (1uH) to 10 turns (33.7uH). The total primary capacitance
of this MMC capacitor is 0.11uF rated at 12kV.
Primary Capacitor Specifications:
Two parallel strings of 6 capacitors
0.11uF rated at 12000V
GE Part Number 42L3332 (0.33uF @ 2000V)
Total 12 Capacitors
Gate Transformer Design
The gate transformer was designed using both PSPICE and verified by bench testing.
Gate Transformer Specifications:
Core: Fair Rite Toroid 5978006401 (Type 78 Material)
Primary Turns: 10T
Primary Rs: 0.003 ohm
Iprimary: 300uH
Secondary Turns: 20T
Isecondary1: 1.22mH
Secondary 1 Rs: 0.160 ohm
Isecondary2: 1.22mH
Secondary 2 Rs: 0.160 ohm
Coupling factor (k) = 0.9993
Note: All values were measured in the lab.
Base Current Feedback Transformer Design
This transformer is used to sample the secondary base current of the DRSSTC and use it to drive the full-bridge
power section of the system.
Base Current Feedback Transformer Specifications:
Core: Fair Rite Toroid 5978006401 (Type 78 Material)
Primary Turns: 2T
Primary Rs: TBD
Iprimary: TBD
Secondary Turns: 70T
Isecondary: 10.15mH
Secondary Rs: TBD
Coupling factor (k) = TBD
Internal Modulator Specifications
The internal modulator is an onboard 555 timer based circuit which is used to pulse the DRSSTC. It is primarily used for
troubleshooting purposes only as an external modulator is used during actual operation of the system.
Internal Modulator Specifications:
Min. pulsewidth: 41us
Max. pulsewidth: 200us
Min. PRF: 69Hz
Max. PRF: 4.3kHz
(using 0.022uF timing capacitor on 555 timer)
Logo, photos and original text are Copyright © 2004 by Eastern Voltage Research Corp.
All Rights Reserved. © 2004 Christopher Hill Web Master.
Last modified August 16, 2005 08:05:23 PM