Essential gEDA Library

put together by: Kai-Martin Knaak
email: kmk@familieknaak.de

General remarks

The catalog of symbols and footprints presented here is supposed to provide reasonable defaults for simple electronics projects. It is self consistent. That is, the default footprint attribute of a symbol points to one of the footprints given in the footprint section.

Note: All symbols, footprints and scripts are licensed GPL 3 for distribution, and unlimited for use. See http://www.gnu.org/licenses.gpl.txt for the details

Symbols

The symbols of the essential lib are designed as generic, yet ready for use. They contain footprint attributes that match items in the footprint section of this lib. The symbols also demonstrate the recommended use of some none-mandatory attributes like "documentation", "comment" and "symversion". There is no need to add attributes to the instances of the symbol in the schematics. The symbols are "heavy" in the context of the geda library debate. (see a recap of the debate in the gschem-FAQ). The set of symbols tries to deliver a look and feel consistent with accepted standard practice in electronics. The choice of symbols is by no means complete. But they should allow for simple projects.

Visible attributes

With a few exceptions, all symbols contain these three visible symbols:

refdes
value
footprint

On placement of the symbol, these attributes are promoted to the schematic. They can be changed per instance in the schematic with the attribute editor. To avoid clutter, only the value of these attributes is visible. Their color is "detached attribute", size is 10 units, except for the footprint attribute, which is size 8. These three attributes are generally placed on top of each other somewhere near the graphics. For slotted symbols, the slot attribute is also visible in the canvas.

Hidden attributes

All symbols in the lib contain these standard attributes in a hidden way:

description
comment
documentation
symversion
author
dist-license
use-license

The hidden attributes are placed top to bottom in this order somewhere above the symbol graphic. Font size is 8, color is "Attribute", line separation is 200 units. In case there is no value known for the standard attributes, but should be replaced with the instance in the schematic, their value is set to the string "unknown". If no value is the intended value, then the value is set to the string "none".

Additional Attributes

There are some attributes which are not (yet) in the set of standard attributes hard coded in source of gschem.

IEC number

If symbols comply with IEC 60617, they may contain a pair of attributes who point to the number and name of the symbol in the standard. Example:

IEC-name=noiseless ground
IEC-number=02-15-02

List attributes

For some symbols there is more than one reasonable footprint in the lib. Most notably, many components come in SMD and thru hole variants. Other symbols may most likely be attributed with one of a small set of standard values (e.g. 1N4148, or 1N4001 for diodes). To make this discoverable, there are two attributes which contain a comma separated list of values.

footprints
values

Currently, these lists are purely informational. Check "show inherited attributes" in the attribute editor to get them displayed. Future versions of the attribute editor may put the items in a drop-down list so you can choose from them with a simple mouse click.

Design

In addition to the standard attributes, the symbols meet the following design criteria:

The sensitive point of all pins is at grid 100 gschem units.
Power pins of integrated circuits are split off to a separate power symbol. A hiddden comment attributes hints what power symbol to use.
Graphic lines are generally width 10
Pin length is generally 100 units.
Pin numbers are hidden, if they follow a generally accepted standard. With box shaped symbols they are placed 50 units above the pin and 50 units outside the box. Pin number size is 8 units.
With box shaped symbols, pin labels are placed 50 units inside the box, vertically centered to the pin. Pin label size is 10 units.

Titleblock

titleblock.sym - A titleblock with detached attributes for title, author, date, revision, etc.
in.sym - input port symbol for sub sheets in a hierarchy
out.sym - output port symbol for sub sheets in a hierarchy

Analog

comparator.sym - generic single comparator
comparator_pwr.sym - power symbol for generic single comparator
instr_amp_8pin.sym - generic eight pin instrumentation amplifier
opamp_with_pwr_pins.sym - generic operational amplifier with explicit power pins
opamp_single.sym - generic single operational amplifier
opamp_single_pwr.sym - power symbol for the generic single opamp
opamp_dual.sym - generic dual opamp
opamp_dual_pwr.sym - power symbol for dual opamp
opamp_offset.sym - opamp with offset compensation at pin 1 and pin 4
ota_LM13700.sym - dual operational transconductance amplifier (OTA), model LM13700
ota_LM13700_buffer.sym - buffers of LM13700
ota_LM13700_pwr.sym - power pins of LM13700
regulator_positive_fixed.sym - linear voltage regulator with fixed positive output. E.g LM7805
regulator_positive_variable.sym - linear voltage regulator with adjustable positive output. E.g LM317
regulator_negative_fixed.sym - linear voltage regulator with fixed negative output. E.g LM7905
regulator_negative_fixed.sym - linear voltage regulator with adjustable negative output. E.g LM337
voltage_reference.sym - precision voltage reference, e.g. REF02, REF01, AD780

Generic discretes

cap_horiz.sym - capacitor, drawn horizontally
cap_vert.sym - capacitor, drawn vertically
diode.sym - diode
zener.sym - zener
igbt.sym - N-channel enhancement IGBT
res_horiz.sym - resistor, DIN EN style, drawn horizontally
res_vert.sym - resistor, DIN EN style, drawn vertically
res2.sym - resistor, ANSI style, drawn horizontally
npn_transistor.sym - NPN transistor
pnp_transistor.sym - PNP transistor
nmosfet.sym - N-channel MOSFET
nmosfet_power.sym - N-channel MOSFET with body diode
pmosfet.sym - p-channel MOSFET
pmosfet_power.sym - P-channel MOSFET with body diode
igbt.sym - N-channel enhancement IGBT
potentiometer.sym - potentiometer, drawn horizontally
potentiometer_vert.sym - potentiometer, drawn vertivcally
varistor.sym - varistor

Digital

7400_4xNAND.sym - 4x two way NAND
7400_6xNOT.sym - 6x two way NOT
7432_4xOR.sym - 4x two way OR
7486_4xXOR.sym - 4x two way XOR
74112_2xJK_flipflop.sym - 2x JK-flipflop
74161_4bit_counter.sym - 4 bit programmable counter with clear
74_pwr.sym - symbol for power pins of 74** components

Power

These symbols provide a specific net

gnd.sym - ground
vcc.sym - positive logic supply
vee.sym - negative logic supply
Ub+.sym - positive analog supply
Ub-.sym - negative analog supply
5V+.sym - +5 V
nc.sym - deliberately not connected

Specific

photodiode_BPW34.sym - photodiode BPW34

Misc

jumper.sym - two pin jumper
jumper_3pin.sym - three pin jumper
jumper_default.sym - graphical symbol to mark the default setting of a jumper

Footprints

Discretes

res_400mil.fp - resistor, thru hole, approx. 10mm pin distance
res_300mil.fp - resistor, thru hole, approx. 15mm pin distance
res_800mil.fp - power resistor, thru hole, approx. 20mm pin distance
res_vert.fp - resistor mounted thru hole, vertically
cap_100mil.fp - capacitor, thru hole, 100 mil pin distance
cap_200mil.fp - capacitor, thru hole, 200 mil pin distance
cap_200mil_a.fp - capacitor, thru hole, 200 mil pin distance, 2.5 mm rectangular shape
cap_200mil_b.fp - capacitor, thru hole, 200 mil pin distance, 5 mm rectangular shape
cap_200mil_c.fp - capacitor, thru hole, 200 mil pin distance, 7 mm rectangular shape
cap_1100mil.fp - capacitor, thru hole, 1100 mil pin distance, 11 mm rectangular shape
elko_RM25_D6.fp elcap, pins 2.5 mm apart, diameter 6 mm
elko_RM35_D8.fp elcap, pins 3.5 mm apart, diameter 8 mm
elko_RM5_D6.fp elcap, pins 5 mm apart, diameter 6 mm
elko_RM5_D10.fp elcap, pins 5 mm apart, diameter 10 mm
elko_RM5_D13.fp elcap, pins 5 mm apart, diameter 13 mm
elko_RM75_D16.fp elcap, pins 7.5 mm apart, diameter 16 mm
elko_RM75_D18.fp elcap, pins 7.5 mm apart, diameter 18 mm
elko_RM10_D22.fp elcap, pins 10 mm apart, diameter 22 mm
elko_BC_D35.fp - elcap by BC Components, diameter 35 mm
dio_1206.fp - diode, SMD, 1206
dio_1812.fp - diode, SMD, 1812
dio_400mil.fp - diode, thru hole, approx. 10 mm pin distance
LED_1206.fp - thru hole LED, SMD, size 1206
LED_3mm.fp - thru hole LED, 3mm diameter
LED_5mm.fp - thru hole LED, 5mm diameter
SOT23_BEC.fp - bipolar transistor, SOT23
TO92_ECB.fp - bipolar transistor, TO92
TO220_ECB.fp - bipolar transistor, TO220
TO220_ECB_LAY.fp - bipolar transistor, TO220, screwed to pcb
TO126_ECB.fp - bipolar transistor, TO126
SOT23_GSD.fp - MOSFET, SOT23
TO92_GDS.fp - MOSFET, TO92
TO92_DGS.fp - MOSFET, TO92, alternative pinout
TO220_GDS.fp - MOSFET, TO220
TO247_GDS_LAY.fp - MOSFET, TO247, screwed to pcb
TO220_GCE.fp - IGBT, TO220
TO220_GCE_LAY.fp - IGBT, TO220, screwed to pcb
var_8mm.fp varistor with 8mm spaced pins, vertical mount
var_8mm_lay.fp varistor with 8mm spaced pins, flat mount
var_10mm.fp varistor with 10mm spaced pins, vertical mount
var_10mm_lay.fp varistor with 10mm spaced pins, flat mount

Generic SMD

SOT23.fp - generic SOT23
0603.fp - generic 0603
0805.fp - generic 0805
SOT23.fp - generic SOT23
SO8.fp - generic SO8
SO14.fp - generic SO14
SO16.fp - generic SO16
SO16W.fp - generic SO16W
SO20.fp - generic SO20
SO20W.fp - generic SO20W
SO24W.fp - generic SO24W
SO28W.fp - generic SO28W

Generic Thru Hole

DIP6.fp - dual inline package 6 pin
DIP8.fp - dual inline package 8 pin
DIP12.fp - dual inline package 12 pin
DIP14.fp - dual inline package 14 pin
DIP16.fp - dual inline package 16 pin
DIP18.fp - dual inline package 18 pin
DIP20.fp - dual inline package 20 pin
DIP24.fp - dual inline package 24 pin
DIP24_wide.fp - dual inline package 24 pin, wide
DIP28.fp - dual inline package 28 pin
DIP28_wide.fp - dual inline package 28 pin, wide
DIP40_wide.fp - dual inline package 40 pin
TO92_123.fp - generic TO92
TO220.fp - generic TO220
TO247.fp - generic TO247
TO247_LAY.fp - generic TO247, screwed to pcb

Specific

BPW34.fp photodiode, model BPW34, thru hole
BPW34S.fp photodiode, model BPW34S, SMD
BPW34_upsidedown.fp photodiode, BPW34, sensitive side on bottom side
BPW34S_upsidedown.fp photodiode, BPW34S, sensitive side on bottom side
SO8_78Lxx.fp - 8-pin version of fixed positive voltage regulator
SO8_79Lxx.fp - 8-pin version of fixed negative voltage regulator
SO8_LM317.fp - 8-pin version of variable positive voltage regulator
SO8_LM337.fp - 8-pin version of variable negative voltage regulator
SOT_78LxxA.fp - for some reason, the most prolific SOT89 version of the fixed positive voltage regulator has input and output swapped.
SOT_79Lxx.fp - SOT89 version of the fixed negative voltage regulator.
SOT89_LM317.fp - SOT89 version of the variable positive voltage regulator.
VISHAY_T18.fp - multi turn cermet potentiometer, length 19 mm, series VISHAY T18, or BI technologies model 89
VISHAY_T93YA.fp - multi turn cermet potentiometer, height 10 mm, series VISHAY T93YA, or BI technologies model 67W
VISHAY_T93YB.fp - multi turn cermet potentiometer, height 10 mm, series VISHAY T93YB, or BI technologies model 67Y
ALPS_RK11K112.fp - single turn potentiometer by ALPS

Connectors

AKL_2PIN.fp - modular terminal, 5 mm pitch, 2 pins
AKL_3PIN.fp - modular terminal, 5 mm pitch, 3 pins

Changelog

A changelog of the essential library is here