DE8424847U1 - Experimental circuit board - Google Patents

Description

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EXPERIMENTAL BOARD Task

For prototype construction, single or small series production of electrical circuits are popularly known as experimental circuit boards used. These consist of an i.a. evenly (preferably with a grid spacing l / lo "= 2.54 mm) perforated insulating material plate more constant Thickness and is used to accommodate (equip) electronic or electromechanical components, their connections (usually also in the usual Grid of l / lo ") through these very holes from the so-called assembly side be plugged in and protrude a few millimeters on the so-called soldering side. Located on the aforementioned soldering side of the experiment boards (copper) surfaces that can be soldered, either in the form of a single ring around each hole, so-called solder eye, (dot matrix PCB) or in the form of parallel strips (strip grid circuit boards) or strip sections. The task of the ring-shaped soldering pads is that To fix the component on the circuit board in the selected position, what happens with the soldering of component connection with solder eye, while the Copper strips at the same time for an electrically conductive connection of at least two switching points. Unwanted connections must be achieved by corresponding interruptions in the copper tracks will. With the dot matrix PCB in particular, it is necessary to have each individual component connection (or solder eye) with at least to provide a connecting wire that leads to at least one other Switching point (component connection, plus potential, minus potential) is performed. This makes test circuit setups time-consuming and confusing.

The object of the present invention is to address the disadvantages mentioned avoid and specify a circuit board structure that

1. easily enables a clear test circuit structure,

2. the necessary wiring work is reduced to a minimum,

3. compact assembly allows «

Solution

The stated problem is solved by * "having a right-angled

Circuit board with a point grid (preferably in the usual 2.54 mm grid) contains additional conductor tracks, as shown in Fig. 1 and below:

Parallel to the (preferably longitudinal) edges of the printed circuit board, conductor tracks (1) of sufficient cross-section are arranged as potential rails (for e.g. positive and negative supply voltage of the circuit), between which the surface with soldering eyes (2) and centrally located holes (3 ) is filled out. Between two rows of punctuation marks (4) there are further conductor tracks (5) which are parallel to one another but run perpendicular to the potential rails and have neither a conductive connection to the soldering eyes (2) nor to the potential rails (1). As can be seen from Fig. 2 , each of the conductor tracks (5) can be soldered (with or without the help of a short piece of wire) to one or the other potential rail (1) as well as to each soldering eye (2) of the two adjacent dot grids (4 ) are conductively connected. This saves you having to make all the usual wire connections between the component connections and positive and negative potential. The initially potential-free conductor tracks (5) can be used for signal transmission or for shielding purposes. To make it easier to solder over, the potential bars (1) can have tips (6) in the direction of the conductor tracks (5) and / or the conductor tracks (5) point-like thickenings (7) at regular intervals (at the intersection of the diagonals of 4 square soldering eyes ) to have.

In order to prevent unwanted over-soldering, in a known manner a so-called solder mask can be printed on the solder side of the circuit board.

A further advantageous embodiment is shown in FIG. 3 . A circuit board of the above type, but with upright, rectangular soldering eyes (11). This results in a greater insulating distance between the soldering eyes (11) and the conductor tracks (12).

Fig. 4 shows another embodiment of a circuit board of the type described above, but with additional rows of points (21) and conductor tracks (22) on the component side. Each solder eye (23) of this

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Dot grids (21) on the component side are above the metallized ones Bore walls with exactly one solder eye (11) on the soldering side in an electrically conductive connection (plated through hole). the Conductor tracks (22) also run on the component side between the rows of point grids (21), but perpendicular to the conductor tracks (12) on the solder side. Preferably those are on the component side arranged soldering eyes (23) are also rectangular and their longitudinal edges are parallel to the conductor tracks (22). By this arrangement made, signal paths from any point in the circuit to any other point with only a few Over-soldering can be made, so that conventional wire connections are completely unnecessary in most cases. The ones built in this way (Test) circuits hardly differ optically from series circuits. Since the point grid arrangement, as explained above, initially not involved in the power line, but mainly the mechanical fixation of the components on the circuit board is used, the soldering eyes (11, 23) can be dispensed with entirely when plated through, which means that larger insulating distances to the Conductor tracks (12, 22) are obtained or the conductor tracks (12, 22) can be made wider. If there are soldering eyes (11, 23) on both sides of the circuit board, a through-hole plating can be indicated the holes are dispensed with; the component connections with the soldering eyes (23) and conductor tracks (22) on the Component side over-soldered.

Claims (6)

Expectations 1. Printed circuit board for the construction of electronic circuits with holes (3) preferably arranged in a grid of 2.54 mm, each of which preferably has individual soldering eyes (2) are surrounded centrally on the so-called. Solder side, characterized in that strip conductors along the edges of the circuit board as potential rails (1) and between the boreholes or Rows of soldering eyes (4) further, mutually parallel, but running perpendicular to the potential rails (1) Conductor tracks (5, 12) are arranged which are spaced apart from the soldering eyes (2) and from the potential rails (1). 2. Circuit board according to claim 1, characterized in that additional Conductor tracks (22) are provided on the so-called component side, which are also between the rows of holes, but run perpendicular to the conductor tracks (5, 12). 3. Leiterplstte - <oh claim 1 or 2, characterized in that that the drilled holes, walls are metallized (plated through) are. 4. Printed circuit board according to claim 1 to 3, characterized in that that the conductor tracks (5, 12, 22) have thickenings (7). 5. Circuit boards according to one of the preceding claims, characterized in that at least partial areas of the conductor tracks (1, 5, 12, 22) and / or the soldering eyes (2, 11, 23) are provided with solder resist. 6. Circuit board according to one of the preceding claims, characterized characterized in that the soldering eyes (2, 11, 23) surrounding the borehole (3) are not round.