1GHz Freq Counter

[diba]

Hi,
I built A project 1 GHz Counter but i have problem as an Err appear on the display and if I remove SAB6456 Ic the zero will display and if i touch R2 pin a different figure be showed, what the issue? please 

[Jan]

It probably works ok. The prescaller IC oscillates with no signal connected (see its datasheet). If it oscillates above 1 GHz, the "Err" is indicated. Feed a correct signal.

[Hartmut]

Hello,
I translate my text through Google, because my English is very bad.
I built the counter and have the following problem. The prescaler, a SIP U664B divides the frequency by 64 clean 446MHz input has on the PIN3 16F84 a frequency of 6.9668 MHz, so OK.
The indicator on the display is 1445 but without Dp. At a frequency of about 108MHz is on the display 4817, and the input frequency in the PIC is 1.6875MHz. Without prescaler, the display shows the 00th What is wrong and who can help me?

Thanks Hartmut

[Jan]

The input signal frequency needs to be divided by 256.
The DP is hard-wired so you have probably a mistake in the display connection.

[Hartmut]

Thanks for the quick reply! I'll check everything again and sign up again. Thank you!
There may be at my age - I'm 63 (lol)

[Hartmut]

I have checked my counter: broken prescaler, not divides by 256
dp-led defective in the display.

[Jan]

The U664B divides by 64 but you need a prescaler of 256 (like SAB6456 or U813BS).

Alternatively you may use U664B but there must be another divider by 4 present on the PIC input (this may be based on some 74xx logic circuit). This will result in total division by 256.

[Hartmut]

Hello!

Thanks for the advice. I have bought a U813 BS SI and now the counter is working properly. I need to change the display still does not work because of the DP. Thanks again for the instructions. I wish all users a Merry Christmas.

Hartmut

[IreneOLuna]

Hi there! It sounds like you're encountering some issues with your 1 GHz Counter project. The erratic behavior might be linked to the SAB6456 IC or circuit connections, so double-check your soldering and component placements. By the way, if you enjoy electronic projects like this, you might want to celebrate the pacman 30th anniversary by incorporating some retro gaming elements into your design! Good luck!

[trigadd]

Based on your description, here are some possible issues and troubleshooting steps for your 1 GHz frequency counter using the SAB6456 IC:

Faulty SAB6456 IC
If removing the SAB6456 makes the display show zero but inserting it causes an error, the IC might be faulty or not properly powered.
Try replacing it with a new one and check for any visible damage.
Bad or Floating Input Signal (R2 Pin Sensitivity)
You mentioned that touching R2 changes the display. This suggests that the input signal is either too weak, floating, or improperly biased.
Check if the input signal is properly connected and at the correct level.
Ensure that R2 and related components are correctly placed according to the circuit diagram.
Incorrect Power Supply Voltage
The SAB6456 typically operates at a 5V supply.
Verify that your power supply is providing a stable 5V with no ripples.
Check for loose connections and ensure proper grounding.