Tayloredge - B7971 Smart Socket PWB

B7971 Smart Socket
Redesign of B7971-V2
(USPS First Class Worldwide Shipping included)

Smart Socket Board
(Schematic (Rev-) / BOM / PIC16F690 Image)

1386-PWB
Circuit Board Only

$2.50

Smart Socket Parts Kit
Includes items 1-9 on the BOM / Labeling / Socket Soldering

Includes:	1	Programmed PIC16F690-I/P
	15	2N5550BU TO92 140V/600mA
	3	22K Resistor
	6	27K Resistor
	4	24K Resistor
	17	33K Resistor
	1	0.1uF 50V X7R Ceramic Capacitor
	17	Mill-Max tube socket pins (See below)
	1	Jumper (Lead clipped from resistor above)

1386-K
Parts Kit

$12.45

Smart Socket PIC
Programmed with Smart Socket code

1386-PIC
Programmed PIC

$4.95

Tube Socket Pins
Mill-Max 0327-0-15-15-34-27-10-0

	ED90081-17 1 set, 17 pins	$10.95
	ED90081-34 2 sets, 34 pins	$14.95
	ED90081-68 4 sets, 68 pins	$21.95
	ED90081-102 6 sets, 102 pins	$29.95

Assembled and tested
Smart Socket

1386-ASM
Assembled SmartSocket

$24.95

SmartNixie HVPS-V (Vertical Module)
Includes 8mm Dia 330uF EEU-FC1C331 input capacitor
1.8V to 16V input, 150V to 200V adjustable output
4W @ 5V input = 23mA @ 180V
8W @ 12V input = 45mA @180V
0.65" x 0.80" x 0.45"
(Datasheet / Radj - Calc / PWM Spreadsheet / ATE / Warranty / Testdata)

1363
HVPS-V

$13.95

SmartNixie HVPS-H (Horizontal Module)
Includes 8mm Dia 330uF EEU-FC1C331 input capacitor
1.8V to 16V input, 150V to 200V adjustable output
4W @ 5V input = 23mA @ 180V
8W @ 12V input = 45mA @180V
0.95" x 0.95" x 0.35"
(Datasheet / Radj - Calc / PWM Spreadsheet / Eagle /ATE / Warranty / Testdata)

1364
HVPS-H

$13.95

Notes

The circuit created by Chris Barron (Yahoo group fixitsan2) covered under a generous license agreement has been redesigned in Proteus CADD. This B7971 14 segment nixie driver board was originally done in the Eagle PCB design program but needed a bit of cleanup for production PCBs to be ordered. The circuit itself was changed as little as possible from the original design.

I have written a GUI to provide for testing serial communication to smart socket strings and includes a font editor for the B7971 SmartSocket UDC (User Defined Character) feature. See the B7971 page and download the Calculators installer <controllers><[1386] SmartSocket> for more info. The protocol is also detailed in the help section of the GUI.

Floating MCLRn (Pin 4)

If you have problems that look like EMI induced resets, consider terminating the MCLRn pin of the PIC (Example). If enough current is pushed through the pin (Or any pin for that matter) from an external transient, the part can latch up and brown-out reset itself or if the programming entry threshold of 10V is exceeded on the /MCLR pin the device will behave unexpectedly.

Accessories

Terminal blocks for P1

Tyco 282834-5 / Digikey A98336-ND (Example)
Phoenix Contact 1725685 / Digikey 277-1276-ND

Socket pins for display tube

Harwin H3161-01 machine pin sockets for 1.02mm diameter nixie tube pins (Farnell, $0.182 @ 1K)
Mill-Max 0327-0-15-15-34-27-10-0 machine pin sockets for 1.02mm diameter nixie tube pins (Digikey, $0.166 @ 1K)