| Products > Test Equipment |
| Replacement for the PM9610 Prescaler for Philips PM6654 High precision Counter |
| << < (15/18) > >> |
| SaabFAN:
New boards are here. Assembly turned out to be quite good. Especially the 0402 Capacitors - Hard to solder those by hand and have it look good :) |
| geostep:
The board looks great! Really looks pro. And I agree, no matter how you try to solder 0402 parts (which are evil small), they never come out looking good. I already PMed about the boards. - George |
| SaabFAN:
Btw. these are the parts that are missing and have to be hand soldered: U1, U2: NXP BGA2869 RF Amplifier U3: LM258T OpAmp (basically any dual OpAmp will work, but the ones with high bandwith might be prone to potentially damaging oscillations) U4, U5: SY100EL33LZG-TR (Prescalers) U6: LM79L05ACZ D1: Bat15-04W D2, D3: Bap50-03 PIN-Diodes D4, D7: 1N4148 (Leaded diode) D5: Bat15 L1: 680nH 0603-Package Inductor VR1: Bourns 3296W-1-102LF (10k 10-Turn Pot) C28: 47uF/10V Tantalum Capacitor - "C" or "D"-Package R3: 352236RFT R6, R7: 3522150RJT P1: SMA-Connector (The ones that can be mounted at the edge of a PCB) P2: 2,54mm Pin Header, 12 Pins, 90 Degree - I recommend ones that have longer pins, as the typical 90degree pin-headers with 6mm long connector-pins tend to be a bit too short. It is possible to solder a straight connector SMD-Style to the board, however. That way the pins should reach the contacts in the slot. Jump_1: Any kind of wire that is flying around on the bench :) The only ones that are a little tricky are the two MMICs U1 and U2. I recommend hot air or a magnifying glas and a small soldering tip for those. Caps should be far enough away from the chips to avoid blowing them off the board if the airflow is not set too high. |
| SaabFAN:
I just realized something: D2 and D3 must of course have their Cathode on the RF-Trace and the Anode connected to GND. There's a small dot on the RF-Trace noting pin 1 of the diode, but it's a bit hard to see. Unfortunately there was a screw up with the shipping labels where the chinese apparently forgot to put my name on the label. Just the street and the city. So I'm still waiting for the parts, hoping the chinese are able to straighten this out quickly with DHL. Otherwise I would be testing the prescalers right now. :) Same issue happened with the boards btw., but they were shipped via UPS and it took one phone call with their customer service to clear it up. A day later I was able to pick up the boards at a UPS Access Point. DHL is a bit more... "German" in that regard it seems (rigid and inflexible, with a fanatical adherence to protocol) and I had to mail LCSC and ask them to fix the problem :) |
| geostep:
A big thanks to SaabFAN for sending me a pair of his new Philips prescaler boards. (Some assembly required!) - George |
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