Order Long Lead Time Parts

DESIGN PHASE:       preliminary design
SUB ELEMENT NAME:   order long lead time parts
VARIABLE NAME:      [HEPOLLTP]
DATE:               REVISION LETTER:     REVISION DATE: 
APPLICABILITY:      all circuits

ACTIVITY:  Determine best sources, substitutes, etc., for
breadboard parts and prepare forms for long lead time parts
likely to be required.

OUTPUT:  Requisition/Purchase Order

ALGORITHM:

[HEPOLLTP] =        engineering hours to order long lead time parts
0.0+                set up time
0.0*                time per part
[PARTS COUNT]       circuit parts count

Case 1 
Case 2 
Case 3 

DISCUSSION:

This is the first activity performed by the circuit designer
since is often paces the critical path schedule.  Any part likely
to be needed is ordered, trading off extra cost of buying parts
that will not be used for lowering the risk of not having parts
needed for circuit breadboard.

Author: Jerrold Foutz, foutz@smpstech.com

Original: Foutz, J., Power Supply Circuit Development Estimating Aid - An Expert System Application, IEEE Applied Power Electronics Conference Record, New Orleans, February 1-5, 1988. Revised 28 February 2001